Timstar

Colour-coded spring balances, in clear bodies with visible spring mechanisms. Calibrated in both newtons and grams.

Colour-coded spring balances, in clear bodies with visible spring mechanisms. Calibrated in both newtons and grams.

Colour-coded spring balances, in clear bodies with visible spring mechanisms. Calibrated in both newtons and grams.

Closely wound steel springs with loops at each end. Spring constant approx. 0.2 N/m.

For demonstrating Hooke's Law. 20 x 16 mm, approximately 30 N/m.

Flat section steel wire in helical coil. Diameter 75 mm.

Flat section steel wire in helical coil. Diameter 75 mm.

Extension springs with known spring constant.

Extension springs with known spring constant.

A set of five springs of the same length but with different spring constants. Each have an eye at one end and hook at the other. Spring constants are: 2.5, 6.0, 10, 15, and 26 N/m.

Comprising FO140110 Student Timer, and two TI170200 Photogates. Ideal for setups with air tracks, dynamics tracks, or other timing experiments which require light gates. Leads not included.

A double photogate with built-in timer and display, which is capable of precise speed measurements, in addition to all the usual tasks of single photogate. • Incorporates timer with display no separate timer required • Easy to operate • Double light barrier direct readout of speed • Laser optics give high precision measurements • Expandable with external sensors (e.g. microphones) • Use two SpeedGates for all the traditional collision experiments • Several SpeedGates can be daisy chained • Pendulum period mode prevents off-by-one errors • Auto rotating display Speedgate can be used as stand-alone unit or pair can be used to carry out all the experiments you can do with two traditional photogates and universal timer plus much more: with the precisely spaced double laser system you get speed readings without length measurements or calculations. The traditional passage time measurements are still possible, if preferred, for teaching purposes. The display divides into two parts giving you immediate access to all results. An adjacent status area shows when light rays are blocked, the state of external inputs etc. SpeedGate is battery powered so can be used as stand-alone unit no cables are required. However, the apparatus can also be powered via USB cable if preferred. It is operated using three pushbuttons, which control primary mode, secondary mode and reset. The reset button also functions as power switch. The primary and secondary modes each correspond to one part of the display. Suggested experiments: • Kinematics of uniformly accelerated motion • 'g' by freefall • Newton's second law • One-dimensional elastic and inelastic collisions • Mathematical pendulum • Speed of sound (requires 2 x SO150400 microphones) Two SpeedGates can be used for collision experiments; the double display will show the two latest measurements. Connect two (or more) SpeedGates together, using the Speedgate Cable, to measure the time interval between the gates e.g. for acceleration experiments. The whole chain is reset with one button press. The timer functions can even be used with external signals e.g. two microphones (SO86270) and SpeedGate makes complete setup for measuring the speed of sound. Easy to work with the display even orients itself automatically when rotated. The Bundle TI180110 comprises two Speedgate units a connecting cable.

Connector cable for the Frederiksen Speedgate TI170100.

A double photogate with built-in timer and display, which is capable of precise speed measurements, in addition to all the usual tasks of single photogate. • Incorporates timer with display no separate timer required • Easy to operate • Double light barrier direct readout of speed • Laser optics give high precision measurements • Expandable with external sensors (e.g. microphones) • Use two SpeedGates for all the traditional collision experiments • Several SpeedGates can be daisy chained • Pendulum period mode prevents off-by-one errors • Auto rotating display Speedgate can be used as stand-alone unit or pair can be used to carry out all the experiments you can do with two traditional photogates and universal timer plus much more: with the precisely spaced double laser system you get speed readings without length measurements or calculations. The traditional passage time measurements are still possible, if preferred, for teaching purposes. The display divides into two parts giving you immediate access to all results. An adjacent status area shows when light rays are blocked, the state of external inputs etc. SpeedGate is battery powered so can be used as stand-alone unit no cables are required. However, the apparatus can also be powered via USB cable if preferred. It is operated using three pushbuttons, which control primary mode, secondary mode and reset. The reset button also functions as power switch. The primary and secondary modes each correspond to one part of the display. Suggested experiments: • Kinematics of uniformly accelerated motion • 'g' by freefall • Newton's second law • One-dimensional elastic and inelastic collisions • Mathematical pendulum • Speed of sound (requires x SO150400 microphones) Two SpeedGates can be used for collision experiments; the double display will show the two latest measurements. Connect two (or more) SpeedGates together, using the Speedgate Cable, to measure the time interval between the gates e.g. for acceleration experiments. The whole chain is reset with one button press. The timer functions can even be used with external signals e.g. two microphones (SO86270) and SpeedGate makes complete setup for measuring the speed of sound. Easy to work with the display even orients itself automatically when rotated. The Bundle TI180110 comprises two Speedgate units a connecting cable.

This Photogate Unit is specially designed to be used together with the Electronic Counter or timer FO140110. It can be used as an optical switch, activated when the light beam is broken and for pendulum period measurements, air track timing, measuring period of rotation etc. The unit is made from impact-resistant plastic with threads for vertical and horizontal mounting using the supplied 10 mm diameter support post. The Photogate Unit is supplied with powerful red transmitter diode, in front of which is a 1 mm slit, and two LEDs on the sides of the unit (red for transmitter, green for receiver), indicating the function. The Photogate Unit can be connected directly to the DIN sockets of the counter and additional photocells can be daisy-chained and connected to the same counter input, for measurement of acceleration etc. Dimensions: 160 x 120 x 28 mm (W x H x D). Gap width: 90 mm.

With two clear glass faces.

This apparatus offers a clear and easy way to observe magnetic fields generated by a constant electrical current. Iron filings can be scattered on the clear surface which passes through the coil and when a current then flows around the coil, the magnetic lines of force will be shown by the alignment of the filings. The apparatus can also be used in conjunction with a magnetic field sensor and/or datalogger. Requires high current laboratory power supply (8-10 A) for best effect. Weight: 1.2 kg. Dimensions (L x W x H): 300 x 200 x 250 mm.

Solenoid - Clear base unit for bench or OHP use, to demonstrate electromagnetic fields around conductors. Available as three different models. Each mounted on base measuring L150 x W150 x H45 mm.

Vertical wire - Clear base unit for bench or OHP use, to demonstrate electromagnetic fields around conductors. Available as three different models. Each mounted on base measuring L150 x W150 x H45 mm.

Twin coils - Clear base unit for bench or OHP use, to demonstrate electromagnetic fields around conductors. Available as three different models. Each mounted on base measuring L150 x W150 x H45 mm.

A double wall tube with iron filings encased between the two layers to show 3-dimensional view of the magnetic field around the magnet. Dimensions 130 x 90mm (L x dia.).

A white frame with transparent window containing magnetic powder in a water based solution for showing magnetic field patterns. When a magnet is present the particles of iron inside become slightly magnetised, so they attract each other and cluster into the lines that show the magnetic field patterns. Includes a pair of small ferrite block magnets and a pair of plastic cased bar magnets and teachers leaflet. Size 225 x 130 x 15 mm.

A free moving magnet mounted in gimble to show the true shape of magnetic fields far better than iron filings or plotting compasses.

Iron filings in a plastic shaker, ideal for magnetic flux experiments. Size 80 mm, approx. 225 g of Iron filings.

This amazing flexible sheet 'visualizes' the direction of magnetic field lines. The sheet is coated with translucent microspheres (hollow capsules) containing very small magnetic nickel flakes suspended in an oil. The flakes inside the spheres align along the field lines when magnetic field is present. The alignment of the flakes, and thereby the magnetic field direction, is visible because of reflected light from the flakes. Useful for quality control, product demonstration, reverse engineering, and educational purposes. 300 x 300 mm, non-laminated film which is great for demonstration purposes as it can be cut to any size or shape as required, is highly flexible and can easily be wrapped around objects. good example is to wrap it around copper tube to 'view' the progress of neodymium magnet as it slowly descends through the tube. The film is also useful for viewing complex magnetic pole geometry close to the magnetic poles, although it does require fairly strong magnetic fields.

This amazing flexible sheet 'visualizes' the direction of magnetic field lines. The sheet is coated with translucent microspheres (hollow capsules) containing very small magnetic nickel flakes suspended in an oil. The flakes inside the spheres align along the field lines when magnetic field is present. The alignment of the flakes, and thereby the magnetic field direction, is visible because of reflected light from the flakes. Useful for quality control, product demonstration, reverse engineering, and educational purposes. 95 x 95 mm laminated film which is ideal for student use as it is more durable and less easy to damage. The film is also useful for viewing complex magnetic pole geometry close to the magnetic poles, although it does require fairly strong magnetic fields.

A very popular and compact Westminster power supply that is ideal for school use in Key stage 4 and 5 physics lessons with its tough steel case protected by a tough powder coated finish that will last years of use. The unit will deliver up to 16 A AC or DC through its colour coded terminal posts. This power supply is very popular for use in electromagnet experiments. •AC & DC Output: Voltages 1-2 V •Current 16 A •Voltage type - Fixed •Output type - Full wave rectified DC & AC •Mains input 230/240 V AC, 50 Hz •Supplied with mains plug and lead •Manufactured in the UK

A versatile and impressive tool for displaying field patterns on an OHP and simulating the magnetising of bar. When four plates are stacked together, they model metal bar that can be magnetised by stroking with bar magnet and demagnetised by shaking. 98 magnetic pins in each plate.

For demonstration of two and three dimensional magnetic field lines. The kit includes magnetic field box, magnetic field plate and three magnets (2 bar magnets and a horse shoe shaped magnet). The magnetic field box as well as the plate contains iron file flakes suspended in viscous liquid. In the middle of the box is placed a magnet forcing the iron file flakes to turn to display the field lines. Likewise it is possible to place a magnet on the plate to visualize the field lines. Box Dimensions: 76 x 76 x 76 mm. Plate Dimensions (W xL x D): 91 x 157 x 9 mm.

A pair of preformed coils, each with 400 turns of copper wire, wound onto former of approx. 150 mm diameter. Each coil is mounted on a support rod, which fits onto the sliders of the track system supplied. This enables the distance between the coils to be varied whilst maintaining alignment along common axis, for measurements and study of magnetic fields. Electrical connection is via 4 mm sockets. Please note: the current should not exceed 1 A, to prevent overheating or damage. Direction of current is marked on each coil. • 150 mm diameter • 400 turns • Max. current 1A

Comprises a 3300 turn coil mounted on a wand, with flying leads terminating in 4 mm plugs. An alternating magnetic field passing axially through the coil will induce an e.m.f., which can be observed on an oscilloscope or AC millivoltmeter. Designed and manufactured in the UK.

Comprising a 10 turn coil of diameter approximately 15 cm, mounted on base with 4 mm connecting sockets. When AC is passed through the coil, an alternating magnetic field is induced, which can be detected with search coil. Requires power supply which can deliver high current at low voltage, such as Westminster Power Supply MA18796. The current must not be allowed to exceed 6 A. Designed by Timstar for AQA A-level physics required activity number 11.

Using high temperature superconductor (HTSC), this kit demonstrates an intriguing magnetic property of superconductors, known as the Meissner effect. The kit demonstrates the levitation of small rare earth magnet above the high temperature superconductor, caused by the partial expulsion of the magnetic flux from the HTSC sample. Liquid nitrogen (not supplied) is required as a coolant, to bring the superconductor below its critical temperature. When the superconductor is cooled, under a weak magnetic field, to a temperature below its critical temperature, it becomes superconducting i.e. loses its electrical resistance. The magnetic field becomes expelled from the superconductor, causing it to become perfectly diamagnetic. At this stage, the sample is said to be in the Meissner state. Please note: liquid nitrogen is required, but not supplied Kit Includes: • Insulated Styrofoam holder • Superconducting HTSC disk • NdFeB rare earth magnet • Tweezers • Instructions, including advice for handling liquid nitrogen

Ceramic magnets. Dimensions: 50 x 19 x 6 mm. Suitable for the Westminster Electromagnetic Kit. Sold in packs of 10.

Ceramic.

In pairs with keepers. 50 x 16 x 10 mm (L x W x D)

In pairs with keepers. 75 x 16 x 10 mm (L x W x D)

A set of 20 painted (red/blue) ferrite magnets for general use in exploring magnetism. Colour coded for easy identification and supplied in a snap top case. Magnet size 14 x 10 x 50 mm.

Tough plastic cased compass with lanyard. Marked with 4 compass points and full 360 degree scale around its edge. Size 45 mm diameter.

The gauss gun (also known as gaussian gun or rifle) is an example of magnetic linear accelerator and uses powerful neodymium magnets to launch steel sphere at high speed. Magnets are held in place part way along the tube (using the steel washers provided), with two steel spheres on the 'downhill' side. Another sphere is rolled slowly towards the magnets and as it gets closer the magnetic attraction causes the sphere to accelerate considerably, resulting in the sphere impacting with the magnets, transferring energy to the sphere at the opposite end of the magnets causing it to shoot off at high speed (similar to how Newton's cradle works). Even faster speeds can be achieved by using series of magnets and spheres. The magnets and steel spheres are contained within clear plastic tube for safety reasons (neodymium magnets are brittle and can splinter, the spheres can be accelerated with some force). Kit includes magnets and steel spheres, washers, a clear plastic tube, a stand for the tube and a brass peg. Instructions for use are also included.

Alnico horseshoe magnet painted red, with keeper. Size 25 mm.

One of the most powerful permanent magnets ever produced. Distance between poles 27 mm. Dimensions (L x H x W): 110 x 103 x 50 mm.

Feel the ultimate pulling power of magnetism with this pair of incredible new Super Magnets. Housed in tough colour coded outer mouldings (red - North, blue - South) the design allows children to safely experience first hand the force of neodymium - currently the world’s strongest permanent magnet! Size 60 mm.

Powerful disc magnets with the poles on the flat surfaces. Please Note: These magnets are brittle and fragments can fly off if magnets are allowed to come together rapidly, potentially causing harm or eye damage. Careful handling is also required to prevent skin from becoming trapped between two magnets. 8 mm depth x 10 mm diameter.

Powerful disc magnets with the poles on the flat surfaces. Please Note: These magnets are brittle and fragments can fly off if magnets are allowed to come together rapidly, potentially causing harm or eye damage. Careful handling is also required to prevent skin from becoming trapped between two magnets. 8 mm depth x 10 mm diameter.

Powerful disc magnets with the poles on the flat surfaces. Please Note: These magnets are brittle and fragments can fly off if magnets are allowed to come together rapidly, potentially causing harm or eye damage. Careful handling is also required to prevent skin from becoming trapped between two magnets. 4 mm depth x 10 mm diameter.

A revised version of the class Whitley Bay Smoke Cell, with LED illumination that runs cool, and will last many years. Using the supplied generator, smoke is introduced to the smoke cell, and the cell is sealed. The lens focuses the light onto a plane within the cell, making single layer of illuminated smoke cells. Observed under a microscope, individual smoke cells can be resolved, and Brownian motion observed. Requires 12 V DC power supply. Suitable microscopes are the Motic SFC-3A range (MI10434 and MI10436) Dimensions: 90 x 46 x 20 mm

Consists of a metal box with a sliding glass front and two detachable glass chimneys. A lighted tea light (night light) is placed beneath the base of one chimney to create convection currents. (Tea lights not supplied). Dimensions (L x H x D): 240 x 90 x 70mm.

Spare chimneys for Convection in Air Apparatus, HE18736.

Consisting of rectangular glass tubing. Dimensions (W x L x Dia.): 210 x 360 x 22mm.

Comprises a capillary tube and thermometer, mounted on a board with a scale behind the capillary tube. The apparatus comes complete with oil in the capillary tube, so no difficult filling with sulfuric acid is required. The relationship between temperature and volume can be observed easily, and an estimate for absolute zero can be obtained through extrapolation of experimental data. Also availabler as class set of 10 in a Gratnells case.

Comprises a capillary tube and thermometer, mounted on a board with a scale behind the capillary tube. The apparatus comes complete with oil in the capillary tube, so no difficult filling with sulfuric acid is required. The relationship between temperature and volume can be observed easily, and an estimate for absolute zero can be obtained through extrapolation of experimental data. Also availabler individually.

The apparatus comprises reservoir with bourdon gauge, connected to vertical glass tube. The reservoir has a needle valve to control pressure, and a high-quality tyre-type valve for attaching the supplied pump. Air does not escape when the pressure is increased, until the needle valve is opened. The pressure is displayed on a bourdon gauge, which has a transparent back, allowing students to see the internal workings. Pressures of up to 3.5x atmospheric pressure can be measured, which provides a good range of measurements. The tube is of strong construction, and is further protected by a plastic safety screen. It has graduations so that the length of the air column can be measured, and is of uniform cross-section, so the volume of air is proportional to the length of the air column. Unlike traditional Boyle's Law apparatus, this unit has no rustable materials, so water can be used instead of oil, which offers superior results, as well as reduced hazard and mess. The water is pumped into the tube, and the pressure and volume of air is measured at regular intervals. The inverse relationship between pressure and volume at constant temperature is easily observed.

This apparatus vividly demonstrates the rise in temperature that occurs when a fixed mass of air in a transparent cylinder is compressed by a hand operated piston. A piece of tinder, which is provided, ignites in the transparent cylinder: much as a diesel engine obtains ignition. The cylinder and piston can also be used to demonstrate the effect of decompression, being the immediate lowering of temperature and the consequent condensation of water vapour inside the cylinder the cloud formed can easily be seen. Cylinder Dimensions: (L) 198.00 mm (OD) 15.00 mm (ID) 9.00 mm

Spare cylinder for Hyman Fire Piston, HE43250.

Spare Tinder for Hyman Fire Piston, HE43250.

This 80 mm diameter hollow metal sphere is connected to manometer (Bourdon) gauge, for demonstrating changes of pressure in closed volume of air when either heated or cooled. Immersing the ball in heated water bath or ice bath allows the relationship between pressure and temperature of the enclosed air to be investigated. The metal sphere is more robust than glass versions and responds to temperature changes little faster.

This simple low-cost apparatus provides means of demonstrating Boyle's law. It is not 100% accurate but it is adequate for demonstrations giving students literally 'feel' for increase in pressure against volume.

A 1 litre capacity round can with screw cap.

To show that the level of liquid in connected vessels is constant irrespective of the vessel size or shape. Consists of four different glass vessels connected by common base tube and mounted on base. Dimensions (L x W xH): 230 x 100 x 160mm.

Hollow metal cylinder with overflow spout. Dimensions (L x Dia.): 100 x 50mm.

For demonstrating how pressure increases with depth. Consisting of a metal cylinder with three identical sized outlets at different levels down one side. Dimensions (H x Dia): 400 x 70mm.

Two-piece set. Brass ring and brass ball mounted in wooden handles. Dimensions (L): 260 mm.

An improvement on the riveted version, this bonded copper and steel bimetallic strip comes mounted in a wooden handle for ease of use. Heating on either side causes the strip to bend as the two metals expand by different amounts. Comes with instructions. Dimensions (L incl. handle): 300mm); Bimetallic Strip (L x W) 200 x 13 mm.

Optical quality rectangular glass block for refractive experiments. Dimensions 114 x 63 x 18 mm (L x W x D).

Rectangular block, 115 x 65 x 18 mm.

Biconvex lens, 75 x 115 x 10 mm (L x radius x D)

Biconcave lens, 75 x 115 x 10 mm (L x radius x D)

Semi-circular block, 75 x 10 mm (Dia x D)

Equilateral Prism, 75 x 10 mm (L of all sides x D)

Set of acrylic blocks including OP11810, OP11815, OP11820, OP11825 and OP11830, pluc a triangular prism.

Acrylic block in the form of shallow S-Shape, ideal for demonstrating total internal reflection. Dimensions 220 x 20 x 20 mm.

The set contains ten 25 mm-thick optical acrylic prisms: - Equilateral triangle 75 mm sides - Equilateral triangle 57 mm sides - Isosceles 90°- 71 mm hypotenuse - Scalene 90° - 78 mm hypotenuse - Rectangle 75 mm x 50 mm - Semicircular 75 mm - Biconvex 75 mm - Biconcave 75 mm - Plano - convex 75 mm - Plano - concave 75 mm

Flexible acetate transmission filter material suitable for making slides for colour mixing experiments or any work involving coloured light. Each set contains sheets: Primary Red, Primary Blue, Primary Green, Magenta, Cyan, Yellow and Neutral Density. The neutral density material gives 50% light transmission with no colour change. Dimensions (L x W): 210 x 148 mm.

Mounted 35 mm slide, red.

Mounted 35 mm slide, green.

Mounted 35 mm slide, blue.

Supplied in A4 sheets in colours red, blue, yellow, green, and orange.

Laminated transparent plastic colour sheets, one each of the primary colours red, blue and green and one each of the secondary colours yellow, cyan and magenta. The sheets are joined at one corner so that different combinations can be overlapped for colour mixing. Dimensions (L x W): 73 x 50 mm.

This Newton's Disc consists of an aluminium plate with coloured segments printed on it. The colours represent the colours of the visible spectrum (red, orange, yellow, green, blue, indigo and violet). When the disc is rotated and the speed increased, the colours start to blur and fuse together and then mix so that the eye, unable to respond rapidly enough, sees this effect as white light. Mounted on base with handle at rear to turn the disc. Weight: 0.8 kg. Dimensions (L x W x H): 250 x 150 x 25 0mm.

This unit contains three coloured light sources (red, green and blue) projected onto screen in overlapping circles. The unit is self-contained, meaning no setup is required, and can be used comfortably by 2-3 pupils at time. The brightness of each light can be controlled independently, allowing any combination of the three. This allows the demonstration of composition of any colour using just the primary colours. Requires 3 x AA batteries.

This motorized Newton's colour wheel is useful for demonstrating that white light is composed of combination of different spectral colours. Comprises a disc with different coloured sectors mounted on low voltage (6V DC) motor box with integral 4 mm sockets. When the disc is rotated at fast enough speed the colours merge to form white (usually off-white). Requires standard variable laboratory power supply (1-6 DC).

An upright case contains three, high powered, accurately colour matched LEDs, each of which has infinitely adjustable brightness. Also supplied is a large, free standing, primary colour shadow mask,a hand held secondary colour mask and a 12 V plug top power supply. The system allows the teacher to project large primary and secondary colour mixing disks onto any vertical surface and to adjust the colour saturation to mix virtually any colour (how do you produce brown). Unlike other systems the purity of the resulting white is outstanding. The unit is extremely easy to use, is easily transportable and comes with full instructions. The only other requirements are a white wall and a darkened/blacked out room. The system may be used to demonstrate both secondary and primary colour mixing, colour shadows and colour reflection/absorption.

Mounted in 50 x 50 mm slide holders. Aperture size 36 x 24 mm. With tough plastic frame. Made in the UK.

Mounted in 50 x 50 mm slide holders. Aperture size 36 x 24 mm. With tough plastic frame. Made in the UK.

Mounted in 50 x 50 mm slide holders. Aperture size 36 x 24 mm. With tough plastic frame. Made in the UK.

Mounted in 50 x 50 mm slide holders. Aperture size 36 x 24 mm. With tough plastic frame. Made in the UK.

Set of gratings 96, 300 and 600 lines/mm mounted on single slide with three 16 x 19 mm apertures. Dimensions 90 x 30 mm.

Economy diffraction grating in 50 x 50 mm plastic slide. Aperture 36 x 24 mm. Screen printed on the slide are the lines/mm, and arrows to indicate the direction of the lines and gaps.

Economy diffraction grating in 50 x 50 mm plastic slide. Aperture 36 x 24 mm. Screen printed on the slide are the lines/mm, and arrows to indicate the direction of the lines and gaps.

Economy diffraction grating in 50 x 50 mm plastic slide. Aperture 36 x 24 mm. Screen printed on the slide are the lines/mm, and arrows to indicate the direction of the lines and gaps.

The relationship between light and colour has never been explained so clearly as with these fun glasses. The double-axis diffraction grating embedded in the lenses ensure that, when looking through these glasses, almost any single light source can be split into 3D spectrum of the component colours. Specifically designed to fit students up to to KS3 but will fit older students.

A Class II ≤ 1 mW) laser pointer for lectures and demonstrations. Powered by 2 x AAA batteries (Not Supplied). Red laser specification 630 - 680 nm

This kit comprises a red laser which attaches and rotates around a graduated plate, which makes it easy to see and measure the incident beam angles for both reflected and refracted beams. It can be used in vertical plane with the cylindrical tank with water or in horizontal plane with the glass optical accessories, which are included. Useful to demonstrate: Verification of the Snell's law of refraction with semi-circular block or cylindrical tank; Total or diffuse reflection with plane mirror; 90° reflections in 90° prism; Double refraction with parallel faces; Determination of the angle of prism; Multiple reflections and refractions in trapezoidal prism. Kit includes; •1 x Laser (powered by 2 x AA batteries – not included) •1 x graduated disc 50 mm diameter •1 x cylindrical tank •1 x plane mirror •1 x rectangular block •1 x right angle prism •1 x semi-circular lens •1 x trapezoidal block

This quality combination class II laser pointer has options for both red and green lasers and is ideal for highlighting and presentations or for comparing the properties of red and green laser light. The unit has chrome finish exterior. 2 x AAA batteries required (not included). Red laser specification: 650 nm, <1 mW. Ultra bright green laser specification: 532 nm, <1 mW. BS EN 60825 compliant and labelled.

A class 2 (< 1mW) laser emitting purple/violet light at 405 nm. Great for demonstrating Total Internal Reflection in bottle of tonic water!

Superb class II (≤1 mW) laser pointer emitting true blue laser light, at wavelength of 445 nm. An excellent addition to the laser range for diffraction experiments etc.

This class II (≤1 mW) red/orange laser pointer, emitting light at wavelength of 635 nm, provides higher visibility (brighter) light than standard 650 nm red lasers for the same power output.

Lens Cleaning Tissues, ""Whatman 105"", 15 x 10 cm.

Double concave. Optically worked glass with ground edges. Dimensions (Dia.): 38 mm.