Timstar

Slide wire pattern mounted on rigid anodized aluminium base fitted with a metric scale with two equal lengths of constantan wire running across their length. Connection to the resistance wires is made via 4 mm sockets. Resistance wires located along the meter rules, giving total length of 2 metres. Complete with knife jockey. Resistance of wire approx 2 Ω/m.

Jockey for Potentiometer

A four decade resistance box covering to 9999Ω in 1Ω steps. Plastic enclosure box with resistance values 5% tolerance. Dimensions (L x W x H): 165 x 80 x 50 mm.

This apparatus provides the basis for student investigations into resistance. Four wires, 500 mm long mounted on an acrylic base and connected via 4 mm sockets. The wires are all Nichrome with diameters of 1.0, 0.8, 0.63 and 0.4 mm giving resistances in the range 0.4 to ohms. A graduated mm scale is included allowing resistance length and resistance This apparatus provides the basis for student investigations into resistance. diameter investigations to be easily covered. Dimensions (L): 500mm.

Mini substitution unit using a single rotary switch to select from twelve values all at 5% 0.5 W. Values in are 100, 330, 470, 680, 1k, 3.3k, 4.7k, 6.8k, 10k, 33k, 47k and 100k. Connections via 4 mm sockets.

A decade resistance substitution box ideally suited for school or college use. The box will simulate resistances from to 999,999 Ω in 1 Ω steps. The value selected is clearly indicated on the dials.

This apparatus contains an NTC bead thermistor with nominal resistance of 4.7 kΩ in a glass tube with electrical connection made by means of 4 mm sockets. Students from KS3 to Post-16 can carry out practical investigations into the thermistor characteristics. Full instructions and specimen results included. Dimensions (L): 220 mm.

Conducting putty is a useful aid to teaching resistivity and the relationship between length and cross-sectional area on resistance. A cylinder 60 mm long and 20 mm in diameter has a resistance of approximately 20 Ω. Can readily be connected into an electrical circuit and both length and diameter can easily be altered by 're-moulding' the putty. Although harmless, plastic gloves are provided to prevent hands from becoming stained. Approx. 100 g.

A 4 mm screw-socket which can be mounted on to panels up to 12.7 mm thick. Supplied in packs of 5. • Current: 10 max • Height above panel: 24-32 mm • 14 mm outer diameter • Thread size 4BA

A 4 mm screw-socket which can be mounted on to panels up to 12.7 mm thick. Supplied in packs of 5. • Current: 10 max • Height above panel: 24-32 mm • 14 mm outer diameter • Thread size 4BA

A handy sized, more environmentally friendly lead-free alloy solder which contains non-corrosive flux. Size: 1 mm dia. X 2 m long. Contains 99.3% tin and 0.7% copper.

General purpose soldering iron to BS3456 (2.14) featuring the same double shaft principle as CS-18. Very low current leakage (1 uA maximum). 230V AC with PVC cable and fitted 13A mains plug to BS1363A. Supplied with 3 mm bit. Operating tip temperature: 420°C.

A useful aid when soldering, gluing, etc.

A range of sturdy, mounted coils, designed for use with laminated cores and clips. The coils have different numbers of turns of copper wire, allowing students to investigate the relationship between voltage and number of turns, showing how transformers work etc. They can also be used to demonstrate electromagnetic induction (Faraday's law). Coils come complete with 4 mm sockets and include these coils: 50+ 100 turns; 200+ 300 turns; 300+ 350 turns; 400+ 500 turns; 550+ 600 turns.

Spare C Core and clip for Westminster Electromagnetic Kit MA91525.

Laminated U-core with armature and clamp screw. Cross sectional area: 20 x 20 mm.

Laminated I-core. Dimensions (W x H x L): 20 x 20 x 83 mm. Mass: 225 g.

Coils to fit EL150800 and EL150806. Made of coloured plastic with 4 mm safety jack connectors. Armatures available separately. The coils are provided with transparent, adhesive polyester foil with effective voltage insulation up to 4500 V to reduce the risk of electric shock. • Hole size: 20.5 x 20.5 mm • Max. current: 2 A • Resistance: 0.7 Ω • Thread diameter: 0.9 mm • Inductance: Approximately 680 µH

Coils to fit EL150800 and EL150806. Made of coloured plastic with 4 mm safety jack connectors. Armatures available separately. The coils are provided with transparent, adhesive polyester foil with effective voltage insulation up to 4500 V to reduce the risk of electric shock. • Hole size: 20.5 x 20.5 mm • Max. current: 2 A • Resistance: 0.7 Ω • Thread diameter: 0.9 mm • Inductance: Approximately 680 µH

Coils to fit EL150800 and EL150806. Made of coloured plastic with 4 mm safety jack connectors. Armatures available separately. The coils are provided with transparent, adhesive polyester foil with effective voltage insulation up to 4500 V to reduce the risk of electric shock. • Hole size: 20.5 x 20.5 mm • Max. current: 2 A • Resistance: 0.7 Ω • Thread diameter: 0.9 mm • Inductance: Approximately 680 µH

Coils to fit EL150800 and EL150806. Made of coloured plastic with 4 mm safety jack connectors. Armatures available separately. The coils are provided with transparent, adhesive polyester foil with effective voltage insulation up to 4500 V to reduce the risk of electric shock. • Hole size: 20.5 x 20.5 mm • Max. current: 2 A • Resistance: 0.7 Ω • Thread diameter: 0.9 mm • Inductance: Approximately 680 µH

For building a simple galvanometer. The insert consists of a permanent magnet with a pointer. The device is fitted with 0-centre scale. Compatible with coils EN140105-EN140120

A laminated, low loss core on which to attach coils in different combinations to demonstrate the principle of step-up and step-down transformers. Various coils can be used for GCSE physics and A-Level physics to show how transformers are used in domestic electrical appliances and in the National Grid for power transmission. Demonstrations work well with the Interscale Demonstration Meter EL52300. The core is made up of highly permeable U-shaped metal sheeting, which can be closed via two clamps with tightening screws. The cross-section of the core measures 40 x 40 mm. Contents: • Transformer core • 1x 6000 turn, 0.2 A coil, with tappings every 2000 turns • 1x 1200 turn, 1.25 A coil, with tappings at 300 & 600 turns • 1x 72 turn, 12 A coil, with tappings at 6, 30, 54, and 66 turns • 1x 600 turn, 2.5A coil, with mains input, switch and protective fuse The Premium Version is supplied in Gratnells tray with insert.

A laminated, low loss core on which to attach coils in different combinations to demonstrate the principle of step-up and step-down transformers. Various coils can be used for GCSE physics and A-Level physics to show how transformers are used in domestic electrical appliances and in the National Grid for power transmission. Demonstrations work well with the Interscale Demonstration Meter EL52300. The core is made up of highly permeable U-shaped metal sheeting, which can be closed via two clamps with tightening screws. The cross-section of the core measures 40 x 40 mm. Contents: • Transformer core • 1x 6000 turn, 0.2 A coil, with tappings every 2000 turns • 1x 1200 turn, 1.25 A coil, with tappings at 300 & 600 turns • 1x 72 turn, 12 A coil, with tappings at 6, 30, 54, and 66 turns • 1x 600 turn, 2.5A coil, with mains input, switch and protective fuse The Premium Version is supplied in Gratnells tray with insert.

To fit the EL180820 demountable transformer kit. Fits 40 x 40 mm core.

To fit the EL180820 demountable transformer kit. Fits 40 x 40 mm core.

To fit the EL180820 demountable transformer kit. Fits 40 x 40 mm core.

To fit the EL180820 demountable transformer kit. Fits 40 x 40 mm core.

To fit the EL180820 demountable transformer kit. Fits 40 x 40 mm core.

Used to demonstrate that a step down transformers can produce currents that are large enough to weld metals or boil water.

Lenz's law transformer accessory kit to demonstrate the production of large magnetic fields and Lenz's law damping on pendulums with and without slits.

Torch bulbs.

12 V, 24 W bulb, with SBC fitting, and axial (vertical) filaments. Suitable for ray boxes. Dimensions 55 x 38 mm (L x Dia)

To safely demonstrate the need for high voltage transmission of electricity. This apparatus clearly demonstrates how this is achieved using the interconnected boxes through which pupils can see the components. The high and low voltage sides are clearly indicated, with resistance wires connected to either side for direct comparison of lamp brightness/energy loss. By gripping the insulated cables the energy loss can be felt in the form of heat. There are also voltmeter sockets for measuring the high voltage. Comes complete with two boxes (transmit and receive), insulated resistance wires, two mounted SBC lamps and full instructions. Touchproof, locking high voltage connectors used throughout it is virtually impossible to get an electric shock Clear lid to the casing so pupils can see how it works and trace the circuit Indicators for low/high voltage Voltmeter sockets for measuring the high voltage Supplied with 2 x kits to make up the pylons AC Power supply and Connection wires are not supplied An additional power supply is required to carry out this experiment, capable of supplying 12V at 5A. Also required are 6 x connecting leads.

Rep HT Leads for EL71435 Mk2

Supplied on reel (60% Copper, 40% Nickel Alloy).

Supplied on reel (60% Copper, 40% Nickel Alloy).

Supplied on reel (60% Copper, 40% Nickel Alloy).

Supplied on reel (60% Copper, 40% Nickel Alloy).

Supplied on reel (60% Copper, 40% Nickel Alloy).

Supplied on reel (60% Copper, 40% Nickel Alloy).

Supplied on reel (60% Copper, 40% Nickel Alloy).

Supplied on reel (60% Copper, 40% Nickel Alloy).

Supplied on reel (60% Copper, 40% Nickel Alloy).

Supplied on reel.

Supplied on reel.

Supplied on reel.

Supplied on reel.

Supplied on reel.

Supplied on reel.

Supplied on reel.

Supplied on reel.

Supplied on reel.

Supplied on reel.

Supplied on reel.

Extra flexible stranded copper wire. Supplied in 25 m reel. • PVC insulated • Diameter: 2.8 mm • Max current: 6 A @ 1000V RMS

Extra flexible stranded copper wire. Supplied in 25 m reel. • PVC insulated • Diameter: 2.8 mm • Max current: 6 A @ 1000V RMS

This high quality stranded PVC-insulated equipment wire is ideal for general interconnection within apparatus. It is suitable for use with crocodile clips EL18500 EL18502. • 7 strand/0.2 mm tinned copper conductor • Overall diameter 1.2 mm • Current rating 2 A • Rating 1 kV rms 1.4 at 70°C • PVC insulation • Supplied on reels of 100 m

This high quality stranded PVC-insulated equipment wire is ideal for general interconnection within apparatus. It is suitable for use with crocodile clips EL18500 EL18502. • 7 strand/0.2 mm tinned copper conductor • Overall diameter 1.2 mm • Current rating 2 A • Rating 1 kV rms 1.4 at 70°C • PVC insulation • Supplied on reels of 100 m

10 lengths. For mains use to BS 6500.

Please note, this wire rusts very readily and will probably have some surface rust when purchased.

Supplied on reel (80% Nickel, 20% Chromium Alloy).

Supplied on reel (80% Nickel, 20% Chromium Alloy).

Supplied on reel (80% Nickel, 20% Chromium Alloy).

Supplied on reel (80% Nickel, 20% Chromium Alloy).

Supplied on reel (80% Nickel, 20% Chromium Alloy).

Supplied on reel (80% Nickel, 20% Chromium Alloy).

Supplied on reel (80% Nickel, 20% Chromium Alloy).

Supplied on reel (80% Nickel, 20% Chromium Alloy).

Single core equipment wire consisting of 6 mm diameter solid Copper core with outer PVC sheathing, giving an overall diameter of 1.20 mm. Supplied as 100 reel. 1.8 A rating.

Single core equipment wire consisting of 6 mm diameter solid Copper core with outer PVC sheathing, giving an overall diameter of 1.20 mm. Supplied as 100 reel. 1.8 A rating.

An updated version of the Worcester circuit board kit, using high quality plastic connectors with brass wire inserts to make the connections. Can be used with bench top power supply or batteries (not supplied). Neater and easier to use than the traditional Worcester Circuit Board kits, with no sharp edges. Kit contains: • 1 circuit board • 9 bulb holders • 16 bulbs • 2 push switches • 1 potentiometer • 12 connecting bars • 1 resistor • 1 coil of wire 19 swg • 1 coil of white wire 24 swg • 1 coil steel wire 28 swg • 2 red wires • 2 black wires • 2 crocodile clips • Graphite rods • Steel wool • Teacher's guide • Student activity sheets

Plain connector.

Worcester circuit board lamp connector.

Spare mounted bell push.

Circuit board only.

Deep insect net with telescopic aluminium handle and high quality mesh which is kind to delicate specimens. Suitable for use at all levels. Size of net: 720 x 300 mm dia. Extendable handle: 500-1000 mm.

For population counts and other measurements in the field. Consists of white plastic coated steel rods 500 mm long with markers at 250 mm which simply bolt together to form quadrat frame. Folds flat when not in use.

Solid square metal frame with 25 squares in total. Dimensions: 500 x 500 mm.

Superior quality plastic coated steel 100 squares. Dimensions: 500 x 500 mm.

The simplest and cheapest way to observe CO2 release! Ideal for individual student use. These respiration chambers can be part-filled with lime water or bicarbonate indicator solution, the organism or material to be tested placed in the top chamber and the carbon dioxide given off or expired can be observed by change in the solution. Observation is easy due to the transparency of the box. The apparatus consists of an external chamber with an internal sample holder which is perforated to allow the exchange of gases. This holder prevents contact between the sample and solution below. Dimensions (Diameter x H): 35 x 75mm.

Pressed steel blade on a 130 mm handle.

The broad opening of this soil sampler makes it easier to inspect the soil sample while it is still in the auger. Total length of the sampler is 63 cm long and it yields soil sample of approximately 49 cm in length with diameter of 22 mm. Made from electroplated steel.

For any number of easy instant pH checks on soil or compost in the laboratory or garden. Reads direct from soil or compost without sampling. Includes full instructions on adjusting pH to suit individual plants. pH readings for pH 3.5 to pH 9.0 instantly shown on the meter's display.

This meter ensures the right individual light and moisture conditions. Tests the moisture deep down where the roots are.

Provides quick indications of soil moisture pH and light conditions.

Set of six stainless steel nesting sieves in plastic frame. Complete with plastic lid and receiver. Mesh numbers 5, 10, 35, 60, 120, and 230.

This Hanna Soil test kit is ideal for testing and monitoring the quality of the soil. Tests include pH level, nitrogen, phosphorous and potassium. Easy to use a soil sample is mixed with water and combined with one of the chemical reagents supplied with the kit. The resulting solution is compared to the colour chart supplied to determine the concentration of the element being tested, which is indicated as low, medium or high traces (except pH, which is between pH4 and pH9, in 1pH increments). The kit comes with all the necessary components for 10 tests of each of the parameters or 25 tests 4 parameters.

Spirit filled thermometer in aluminium tube -10 to 110°C and 20 to 240°F. Length: 225 mm.

A lightweight angle and height measuring instrument. Point it at the top of building or tree, pull the trigger, and then read the angle on the protractor. Height is easy to calculate using the guide supplied

For survey field work. PVC covered wooden poles with solid steel points. Red and white graduated every 500 mm. Dimensions (L x Diameter): 2 metres 28 mm.

Simultaneously displays dissolved oxygen and temperature. Units of measure are saturation mg/L or ppm for dissolved oxygen and °C or °F for temperature. Advanced features include data hold 25 points memory auto power off automatic temperature compensation salinity and altitude compensation. Careful use and maintenance will provide years of reliable service. Easy to replace screw on membrane cap with optional extension cables. • Oxygen level displayed as Saturation or Concentration (mg/L [ppm]). • Adjustable Altitude Compensation (0 to 20,000 ft in 1,000 ft increments) • Adjustable Salinity Compensation from 0 to 50 ppt • Analogue bar graph indicates trends • Memory stores up to 25 data sets with DO and Temperature readings • Self calibration on power up • Data Hold, Auto power off, Low battery indicator • Waterproof to IP57 • Optional 1 m or 5 m extension cable • Complete with DO electrode, protective sensor cap, spare membrane cap, electrolyte and four 1.5 V batteries.

Detects Nitrate at 0, 10, 25, 50, 100, 250, 500 ppm. Supplied in vial of 50 strips.

A unique design feature gives direct reading of wind speed without the need to count revolutions. The low and high calibrations register m/s and the Beaufort scale. Can be hand held or fixed permanently.

This multifunction meter measures number of environmental conditions, as well as wide range of electronics measurement, making it an excellent general purpose meter for school science departments. Featuring auto-range, data hold, relative measurement, backlight, auto power-off, and IEC1010 CatII 1000 V Conformity. • DC voltage: 0.4 V/4 V/40 V/400 V/600 ±0.7 % • AC voltage: 4 V/40 V/400 V/600 ±0.8 % • DC current: 40 mA/400 mA ±1.2 %, 10 A ±2.0 % • AC current: 40 mA/400 mA ±1.5 %, 10 A ±3.0 % • Resistance: 400 R/4 k/40 k/400 k/4 M ±1.2 %, 40 ±2.0 % • Capacitance: 4 nF/40 nF/400 nF/4 μF/40 μF/200 μF ±3.0 % • Frequency: 10 R/100 R/1 k/10 k/100 kHz ±2.0 % • Duty cycle: 0.1 ~ 99.9 ±3.0 % • Temperature: -20 °C 400 °C ±3.0 (0.1 °C), 400 °C 1000 °C ±3.0 (1 °C) • Humidity: 30 % ~ 95 % RH ±5.0 %RH • Light: 4000 lux/40000 lux ±5.0 % • Sound level: 35 - 100 dB ±4 dB • Continuity test • Power: 9 V (6F22) x1 • Size: 185 x 85 x 44 mm

A combined temperature and humidity meter ideal for environmental monitoring. The large LCD is easy to read at distance. Simultaneous display of humidity in RH and temperature in °C or °F; 63 x 80 mm large digit LCD; Min/max memory since last reset; Impact-resistant ABS case with desk stands and wall mounting; Supplied with battery. Dimensions (L x W x D): 138 x 95 x 20 mm. • Temp range: -10°C to +50°C • Humidity Range: 25% to 98% RH • Resolution: 0.1°C, 1% RH • Power: x 1.5V AA battery (supplied); • Weight: 143g

Though the use of blood type in forensic investigation is not enough to prove guilt, it may aid in exonerating potential suspect. In this activity, students act as lab technicians and assist investigators by examining evidence collected at crime scene. Students first use a presumptive blood test to determine if a substance on a stained piece of cloth may be blood, and then determine the blood type of a sample collected at the scene. Students then compare their results to those of samples provided from two suspects. Kit contains enough materials for 10 groups. Teacher's Manual and Student Study Guide copymasters are included. Kit includes: • 40 Blood typing trays • 10 Cotton swabs • 1 Cloth • 1 bottle 70% ethanol • 1 bottle Blood detection reagent #1 • 1 bottle Blood detection reagent #2 • 4 Simulated blood samples: Victim, Suspect #1, Suspect #2, Crime Scene Evidence • 1 bottle Simulated anti-A serum • 1 bottle Simulated anti-B serum • 1 bottle Simulated anti-Rh serum

Blood typing is a method of classifying blood based on the presence or absence of specific proteins (erythrocytes), on the surface of red blood cells. Blood type, an inherited characteristic, is valuable to know in that it affects medical procedures, such as surgery and transfusions, paternity testing, as well as serving as evidence in criminal investigations. Determining blood type can help provide supporting evidence or eliminate a possible suspect's involvement in crime. This activity includes a teachers manual and a student guide and analysis copy-masters. There is enough material for 15 groups. Note: This activity uses Innovating Science Simulated Blood and is safe for classroom use. Kit Contents: • Blood typing trays • 4 Simulated blood samples: Victim, Suspect #1, Suspect #2, Crime scene • 1 set ABO/Rh blood typing anti-sera • 1 pack mixing sticks

Crime scene investigators examine the scene of possible violent crime for evidence, such as fingerprints, hair, fibre, etc. After collecting the evidence, they notice there is no visible blood. Someone sprays the area with a liquid then turns out the lights. A strange, faint glow appears in certain areas of the scene. Learn how Luminol is used in scenes like this everyday. The special Luminol formulation does not require a separate hydrogen peroxide catalyst. Simply re-hydrate and use with the simulated blood haemoglobin to show your class. This activity includes an instruction manual with suggested activities. There is enough material for several demonstrations. Kit Contents: • 1 bottle Luminol • Re-hydrating Solution • 1 bottle Luminol powder • 1 bottle simulated blood haemoglobin

ABO typing of blood left at the scene of crime can help to narrow down a list of suspects. In this experiment your students will use agglutination to identify the blood group of unknown blood samples as a step to identify a criminal. Kit Includes: instructions, control ABO simulated blood samples, unknown simulated blood samples, transfer pipettes, microtitre plate. All You Need: automatic micropipette (5-50 µL) with tips (optional). For 10 Lab Groups. Complete in 45 minutes.