Timstar - Science

The HI-190M-0 is a compact and lightweight mini magnetic stirrer with plastic cover and can stir up to 1 litre. The compact size of this stirrer allows users to maximise bench space for efficiency and safety The internal Speedsafe™ mechanism ensures that the maximum speed of 1,000 rpm is never exceeded. The ABS housing will resist the most harmful chemicals in the classroom. Supplied with; •ABS cover •Micro stir bar •Instructions

An extremely good value compact magnetic stirrer, ideal for student use. The base is white to allow unaffected observation during experiments with colour indicators. The unit has adjustable feet to ensure stability on the bench. The speed is adjustable, and is controlled by the intuitive rotary knob on the front, which also controls power. Supplied with SELV (Safety Extra Low Voltage) AC adaptor, and magnetic stirrer bar.

An extremely good value compact magnetic stirrer, ideal for student use. The base is white to allow unaffected observation during experiments with colour indicators. The unit has adjustable feet to ensure stability on the bench. The speed is adjustable, and is controlled by the intuitive rotary knob on the front, which also controls power. Supplied with SELV (Safety Extra Low Voltage) AC adaptor, and magnetic stirrer bar.

Magnetic, encased in PTFE. With centre rim.

Magnetic, encased in PTFE. With centre rim.

Magnetic, encased in PTFE. With centre rim.

Magnetic, encased in PTFE. With centre rim.

Magnetic, PTFE coated stirring bar retriever. 35 cm in length.

This timer is most suited for an investigational approach for students to gain sound understanding of the concepts of time and motion. Two pairs of sockets alternately start and stop the timer, one pair operating in make mode, the other in break mode. The start/stop switches can be either mechanical or electronic. The timer is auto-ranging for ease of use and has clear 13mm digital display and has robust metal case with durable powder coat finish. An illuminated on/off switch is mounted on the rear panel adjacent to fused appliance inlet. • Electrical Supply: 220-240 V AC 50-60 Hz • Dimensions (W x L x H): 179 x190 x 85 mm • Mass: 1.6 kg • Ranges: 0 to 9.999s; 10 to 99.99s; 100 to 999.9s; 1000 to 9999s • Accuracy: ±0.01%

For use as a light operated timing gate. Comprises a photodetector and light source each housed in a robust ABS case spaced 40 mm apart on a plastic rod. Light source housing has a battery compartment and on/off switch. Photodetector housing is fitted with pair of 4 mm sockets to allow connection to electronic timers. When the timing gate is switched on it creates a short circuit between the two output sockets, this then becomes an open circuit each time the light beam is interrupted. Consequently the timing gate can be used as a remote switching device in wide range of dynamics experiments.

Replacement Cartridge for Deioniser, Vision 125

A compact all glass still, which can be wall or bench mounted. Produces up to 4 litres per hour of single distilled water. Consisting of horizontal boiler with 3 kW heating element and double coil condenser which cools the distillate to around 30 °C. The boiler can be drained via a stopclock and cleaned without dismantling. Two independent, automatic safety thermostats are fitted to prevent overheating. Supplied with level control device which turns the heater off when the reservoir is full. Requires minimum flow of1 l/minute. Dimensions 540 x 160 x 410 mm (W x D x H)

Spare boiler for the Distinction water still, WA17601.

Spare heater for the Distinction water still, WA17601.

An economically priced, wall mountable, all-glass water still, producing 4 litres per hour single distillate. With two independent safety thermostats, condenser, boiler, 3 kW sheathed heater and screw thread connections. Includes acid addition port and drain cock system for descaling the boiler. Dimensions 500 x 150 x 450 mm(W x D x H).

This water still produces ready-to-use cold, distilled water. The high quality borosilicate glassware coupled with silica sheathed heaters gives pyrogen-free distillate of the highest purity from virtually any raw water supply. The boiler feed is pre-heated to increase efficiency. The unique condenser design ensures that the droplets of distilled water remain in contact with the cooling coil for the longest possible time ensuring maximum energy transfer. All-glass construction allows rapid descaling using strong mineral acids. built- in ""clean"" function and integral acid addition funnel make the cleaning operation simple and safe with no need to dismantle any of the glassware. large bore stopcock with PTFE key is fitted for easy draining of chemicals after cleaning. A flow sensing device prevents overheating, and allows the unit to run on water supplies with pressure as low as psi (20 kPa). Requires a minimum flow of 1 litre per minute. There is an over-temperature thermostat mounted in the boiling chamber as an additional fail-safe. The acrylic safety screen and the cabinet lid are removable giving easy access to the glassware components. Screw threads are incorporated on all water connections so hoses can be fitted and removed easily and safely without risk of breakage. The control is simple and effective system which can be fitted to virtually any type of reservoir vessel. It will turn the still off when the reservoir is full, and restart it when the level in the reservoir drops, making it fully automatic. • 4 litres per hour output • Highly efficient • Fully automatic • Built-in ""clean"" function • Wall mounting bracket included

This battery has a 7 year shelf life and are suitable for high drain rate applications (although lithium cells may work better in some applications). It also has better low temperature performance than Zinc cells.

This battery has a 7 year shelf life and are suitable for high drain rate applications (although lithium cells may work better in some applications). It also has better low temperature performance than Zinc cells.

These batteries have 7 year shelf life and are suitable for high drain rate applications (although lithium cells may work better in some applications). They also have better low temperature performance than Zinc cells.

These batteries have 7 year shelf life and are suitable for high drain rate applications (although lithium cells may work better in some applications). They also have better low temperature performance than Zinc cells.

These batteries have 7 year shelf life and are suitable for high drain rate applications (although lithium cells may work better in some applications). They also have better low temperature performance than Zinc cells.

These batteries have 7 year shelf life and are suitable for high drain rate applications (although lithium cells may work better in some applications). They also have better low temperature performance than Zinc cells.

For watches, calculators etc.

For watches, calculators etc.

For watches, calculators etc.

For watches, calculators etc.

For watches, calculators etc.

For watches, calculators etc.

Packs of 5.

Battery Holder, AA Size.

Battery holder, 2 x AA batteries, with leads.

Battery Holder D Size. Pack of 5.

PP3 snaps with leads. Pack of 10.

Holds 4 x D (R20) batteries with outputs at 1.5, 3, 4.5 and 6 V. Batteries and leads not supplied. Each output has 4 mm socket.

Test the condition of your batteries using this low-cost, versatile and compact battery tester. The tester uses the power of the battery you are testing to power itself, so does not require batteries. • Suitable for checking the state of Zinc chloride, Alkaline and Rechargeable batteries • Will test AAA, AA, C, D, 9V PP3 and batteries

These low cost batteries have 2 year shelf life and are suitable for low drain applications.

These low cost batteries have 2 year shelf life and are suitable for low drain applications.

These low cost batteries have 2 year shelf life and are suitable for low drain applications.

These low cost batteries have 2 year shelf life and are suitable for low drain applications.

These low cost batteries have 2 year shelf life and are suitable for low drain applications.

These low cost batteries have 2 year shelf life and are suitable for low drain applications.

Apparatus for measuring rates of absorption or evolution of gases from organisms. Comprises two stoppered boiling tubes with wire baskets to support organisms. Each boiling tube is connected to simple manometer tube via three-way tap. The manometer tube is mounted on scale to measure the position and movement of the liquid level as gas is evolved or absorbed. The organism of interest is placed in the basket of one of the tubes, which also has some potassium hydroxide solution to absorb carbon dioxide. The other tube acts as thermobarometer, to counteract changes in temperature. Full instructions are included.

Spare Wire Baskets for BI180500

Explore the primary, secondary and tertiary structure of proteins with the captivating models and tools in this dynamic kit. This engaging, hands-on protein folding kit makes teaching protein structure basics easy. Students will fold a protein while exploring how the chemical properties of amino acids determine its final structure. Students can use the Amino Acid Starter Kit© to: •Learn that the 20 amino acids all share a common backbone but have different side chains, each with different chemical properties. •Identify the chemical properties of the side chains through a dual colouring scheme guided by the kit’s chemical properties circle, amino acid side chain list and coloured plastic clips. •Group the side chains into one of 5 categories: hydrophobic (nonpolar), hydrophilic (polar), negatively charged, positively charged, and cysteines, which sometimes form disulphide bonds. The coloured clip at the base of each side chain indicates chemical properties while embedded coloured balls in the amino acid side chain model show atomic structure. •Employ the kit’s protein-folding activities to first explore the primary and tertiary structure of proteins by constructing a generic 15-amino acid protein, then learn about the secondary structure of proteins by folding a toober model of the first of 3 zinc fingers of the Zif268 protein. Each 1-group set includes 1 chemical properties circle, 1 amino acid side chain chart, 22 amino acids, 1 mini toober, 22 coloured plastic clips and 6 hydrogen bond connectors.

These versatile modelling Toobers provide hands-on learning experiences in biology and chemistry. Students can model DNA or create protein structures and explore basic protein-folding principles. Toobers are flexible foam rods which have soft wire core that allows them to hold their shape well and they can be simply straightened out afterwards and re-used. Length: 120 cm long. Please note that theses are sold individually and the push pins are not included. See also 'Amino Acid Starter Kit' (MO110150). Also useful for teaching: • How hydrophilic/hydrophobic side-chains influence protein's structure • How structure is critical factor in many protein's function

This life size 2 part human brain is a median section model. The right hemisphere has the cerebellum and the stem with occipital lobe. On base. Numbered with English Key Card. Dimensions 190 x 150 x 150mm (D x W x H).

This 5-part classic brain model is an original anatomic cast of real human brain and comes divided along the midsagittal plane. The components of the brain's left half are: • Frontal and parietal lobe • Temporal and occipital lobe • Encephalic trunk • Cerebellum With integral magnets for easy viewing and hands on learning, the classic brain is great education tool for teaching and learning about the human nervous system and anatomy of the brain. The model comes complete with removable base for mounting and display purposes.

Students will immediately become engaged with this interactive foam model of double-stranded DNA and single-stranded RNA. The DNA Starter Kit© is schematic model that transforms from the familiar ladder shape to the double helix with twist. Students can explore the structure of colour-coded DNA bases showing purines and pyrimidines which connect to continuous sugar-phosphate backbone. Then they can delve into replication and transcription. Using individual nucleotide triphosphates, they can synthesize new strand of DNA one base at time showing the semi-conservative replication of DNA. Finally they can synthesize mRNA one base at time to show the process of transcription. Each kit includes: 51 bases (12 red adenine, 12 yellow thymine, 12 blue cytosine, 12 green guanine, 3 white uracil), 4 continuous grey backbones, 24 grey sugar-phosphates, 12 lavender sugar-phosphates and 48 orange phosphates.

The sky is the limit to what you can teach using these new large-scale, colour-coded foam nucleotides. Begin by teaching the complementary A-T and C-G base pairs and the antiparallel nature of double-stranded DNA. Move on to the flow of genetic information as you teach the basic processes of semiconservative DNA replication and mRNA transcription. You can then stretch students by introducing PCR (polymerase chain reaction) and the Sanger DNA sequencing method -- and much more. 80 Large-Scale Nucleotides: • 20 Red Adenosine • 20 Yellow Thymine • 20 Blue Cytosine • 20 Green Guanine 80 Adhesive-Backed Round Magnets

The model shows DNA and transcription of RNA. Height approx 500 mm. Complete with stand, instructions and model description.