This handheld device provides a qualitative visual indicator of the conductivity of different solutions, acids or salts. Two brass probes can be touched to a solid substance, or immersed in a liquid, to show conductivity on green LEDs that range from 1 to 10. Each probe is 53mm long with a diameter…

The classic method for demonstrating and measuring the small force experienced by a conductor carrying an electric current in a magnetic field. One half of the balance is placed inside a solenoid. The other half has an adjustable counterweight and can carry light additional masses. When current is…

Made from Plate Glass, with carefully ground and polished optical survaces, and cleanly ground edges, these lenses feature a diameter of 38mm - 125mm and focal lengths from 50mm - 500mm.

Recommended for grades 3 to 8, this set is ideal for introducing students to the concepts of changing force by levers and pulleys, and the notion of mechanical advantage. The manual describes experiments with the three types of levers, single and double pulley systems, and shows the characteristics…

Five pounds of black wax for dissecting trays.

Accurate, non-rolling hexagonal masses are made of steel, and feature a durable black oxidized finish. Available in both customary and metric sizes.

This basic breadboard kit contains all of the basic connecting parts to start exploring circuit design. The kit includes a variety of connecting cord sizes and two breadboards. All that is required is to provide components such as resistors, LEDs, or capacitors. Kit Contents: …

This convenient free fall apparatus for measuring the acceleration of gravity has a 150 CM fall length. It comes with an electromagnetic ball release, a pair of photogates on a long cable harness, two steel balls, a plumb line, a catcher , and an instructional manual. Requires the digital timer…

High precision interferometer with interchangeable optics for Michelson or Fabry-Perot setups. 200 MM precision geared lead screw for fine adjustment. This product has a 90 day lead time. Market standard for this type of product.

Flexible, 18swg stranded wire cord with a stackable banana plug at one end and an alligator clip at the other end. Alligator clip has a protective vinyl sheath.

Demonstrates how the lungs are filled and emptied with air through contraction and relaxation of the diaphragm muscle. The two balloons act as the lungs and the rubber sheet acts as the diaphragm. Pulling the rubber sheet downward created pressure within the chamber causes the balloons to…

These spring scales feature a clear plastic tube design, and are color-coded. A zero adjustment screw is provided at the top. Overall length approx.7".

Our Radiometer is made from a glass bulb from which much of the air has been removed. Inside the bulb, on a low-friction spindle, is a rotor with 4 vanes. Each vane has one blackened side and one silvered side; one black vane features a white dot in order to count rotations easily. When exposed to…

Index of refraction plate, made from acrylic or glass.

Weights are made of brass, with nickel plated surfaces. All weights are carefully tested and calibrated. Analytical Weight Box contains a total of 9 weights from 1 to 100 grams, in polished wooden box, with fractional weights, rider and forceps.

Set of equipment for studying the Zeeman Effect in the mercury green line at 545.1 nm. Includes a 1.0T electromagnet that allows longitudinal or transverse viewing, a mercury lamp, interference filter and lens, a 2.0MM gap Fabry-Perot etalon, a CCD camera and capture card, and evaluation software. …

Painted Red and supplied with a keeper. Available in 3"; (left photo) or 1"; (right photo)

This Hall's carriage has a durable plastic body with a roomy well for additional masses (not included). The machined aluminum wheels and axles are mounted on hardened steel cone bearings for minimum friction and long life. For use with all types of inclined plane. Shipping weight: .30 Lbs.,…

This quality built nylon insect net features a telescoping aluminum handle that extends from 18" to 32". A simple twist of the handle locks and unlocks the handle for varying lengths. A 48" long conical net is mounted on 14" ring.

The Earth acts like it has a huge bar magnet located at its center. This set contains a globe that is 110 mm wide with a magnet contained along its axis. The magnaprobe contains a small magnet that is allowed to rotate on two axes. This set illustrates the path of the magnetic field…

This large van de Graaff generator uniquely offers alternative drive modes, either hand-cranked or motor driven. Excellently constructed, the generator reliably delivers charge and sparks 10cm long and more immediately on setting it in motion, even under high humidity conditions. In hand-cranked…

Made from plate glass about 2mm thick with highly silvered back.

Sturdy support for meter stick demonstration balances and torque experiments. The cast metal support is 18.5 CM high. Requires knife-edge clamps, slotted weights and hangers, and a meter stick. Shipping weight: 0.5 Lbs., dimensions: 7" x 3" x 3".

All plastic construction. Dual scale range is 6" or 150mm. Readability is 1/128" or 0.05mm.

Acrylic Semi-circular Lens, 75mm base, 15mm thick.

2"; long, plain, chrome plated alligator clips with excellent conductivity. 2"; long, with insulated sleeve, chrome plated alligator clips with excellent conductivity. Pack of 10, five each red and black.

25 meters of durable string designed to be used with pulleys or force tables. The thread is made of cotton and measures at 1/16 inch (1.5 mm) diameter.

These weight sets include accurate, non-rolling hexagonal masses made of steel, and feature a durable black oxidized finish. Sets are supplied in sturdy cardboard boxes. Metric Weight Set includes two each of 5g, 10g, 20g, 50g, and 200g masses,

Folding magnifier in a pouch. 50mm diameter, 2.5x magnification.

This excellent instrument is easy to set up and easy to use and is designed for students to make precise measurements. This unit features high quality 22MM optics, a built-in illuminated auto-collimator for fast set up, a 17.8 cm diameter divided circle with clear gradations, a double-ended vernier…

Each specimen in this set of five diverse materials cylinders has identical mass and radius. Materials included are acrylic, PVC, nylon, aluminum and brass. Includes a storage box and activity guide.

This magnifier offers an extra large field of view, hands free use, and folds down to a compact size for storage. Its 10cm lens provides 6x magnification. Ideal for use on a lab table, and for dissecting small specimens like owl pellets.