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.

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.

The classic demonstration of spectral lines. Each tube has its characteristic spectrum when energized before a spectroscope. These tubes acquaint students with the spectra of common gasses in their pure form as well as for demonstrating wavelength. The glass tubes are 25 cm long with the capillary…

Each unit consists of a wooden resonator box, tuning fork, and a tuning fork mallet. Resonator box is 18cm x 9cm x 5cm.

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".

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

This sturdy pulley is excellent for use with an inclined plane or any other similar apparatus. Ite features a 4-cm plastic pulley mounted on a chrome plated steel rod. The overall length is 15cm and the shaft diameter is 8mm.

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.

Includes a 50g aluminum hanger and 12 aluminum weights, 9 x 20g, 1 x 10g, and 2 x 5g.

This apparatus allows students to study the magnetic field around a wire. Heavy brass wire with terminals is arranged on a calear plastic base. Also included are 1 each 45mm comlpass, and 6 each 16 mm compasses and an activity guide.

The set contains 6 glass lenses: one each of double convex, plano-convex, concavo-convex, double concave, plano-concave, and convexo-concave. Includes a reusable cardboard storage box.

Index of refraction plate, made from acrylic or glass.

This sturdy electroscope features a metal case with front and rear glass windows for preventing air currents from affecting the deflection of the leaves. Leaves are gold and aluminum. Leaf support rod is held in place by an insulating plastic sleeve. A graduated scale is also provided for measuring…

Made from clear acrylic. One plane surface is frosted.

Deluxe slotted weight set with rack, 8 weights, brass. Includes 1x500g, 2x200g, 1x100g, 1x50g, 2x20g, 1x10g, rack. Deluxe slotted weight set with rack, 10 weights. Deluxe slotted weight set with rack, 12 weights, brass/aluminum. Includes 1x500g, 2x200g, 1x100g, 1x50g, 20g, 1x10g, 1x5g, 2x2g,…

We offer a variety of economical ceramic bar, disc, and ring shaped magnets. Magnets are upainted, except where noted.

The kit contains a variety of custom made and unique components, including Force Board, Inclined Plane, and Vector Board. Also included is a complete set of accessories needed for 15 different activities, including an 11 piece weight set, spring scales, pulleys, levers, support base and rod, and…

These uncalibrated specific gravity bottles are excellent for determining the specific gravity of liquids. The borosilicate bottles have a ground stopper joint for a precision fit. Available in 10 ML or 25 ML sizes.

Includes 1 each of 1, 5, 10, 50, 100, and 500 mg weights, and 2 each of 2, 20, and 200 mg weights. Rectangular plastic box with rider and forceps.

Single folding magnifier in an aluminum case. One lens, 25mm diameter, 10x magnification

Equilateral prisms, made from high quality clear glass sheet with highly polished surfaces.

Optically true glass with scratch-resistant copper back silvering individual glass mirrors ideal for a variety of optics experiments. Focal lenghts available from 25mm - 300mm.

Durable, lightweight plastic instruments, designed for whiteboards/chalkboards. Triangles, protractor, and ruler are made of white polystyrene and feature handles for ease of use. Compass is made of clear acrylic, and accomodates most dry erase and magic markers. Triangle, 45 degree, 23" base, 16" sides.

Plastic Insulated Copper wire is 22 gauge, supplied in 100 foot rolls and available in three colors. Bare Nickel Chromium Wire is supplied in 4 ounce spools. Enameled Copper Magnet Wire is supplied in 4 ounce spools. Soft Bare Copper Wire is available in 4 ounce or 1 lb spools.

Individually calibrated weights made of high quality stainless steel. Both sets come with a sturdy plastic storage block. Set of 9 includes 1 each of 5g, 10g, 50g, 100g, and 500g, plus 2 each of 20g and 200g weights. Set of 10 includes all of the previously mentions, plus 1 each 1000g weight.

Magnifying Glass with Glass lenses molded into high quality unibody plastic frames.

Includes two acrylic lenses, one each of double convex, and double concave, and three mirrors, one each of convex, concave and plane. Packed in a cushioned wood storage box.

This simple tool measures wind speed and direction. The wind speed range is 0 to 17 meters per second (+/-10%). The direction indicator is divided into 16 compass points. A built-in compass is provided. Shipping weight: 4.4 Oz., dimensions: 9" x 6" x 6".

Density Blocks

Featured displays of this electronic alarm stopwatch include time (hours-minutes-seconds, with 12 or 24 hour mode option), calendar, 24-hour stopwatch, alarm, hourly chime, 1/100 second chronograph, split time, and total time. It is lightweight, easy to operate, ad comes complete with battery and…

The United Hartl Optical Disk is a compact apparatus that demonstrates the behavior of optical elements by means of ray paths through clear acrylic models. It consists of a circular 9” diameter graduated disk mounted on a stand and fitted with a ray box on an adjustable arm. Narrow, parallel…

This magnet is generally fed to cows to attract metal particles they may have ingested while grazing. Students can use it in the classroom for magnetic field demonstration and other interesting experiments.