The kit illustrates that the resistance of a wire depends on its length, diameter and material of that wire. Each of the eight coils is wound on plastic spools with brass terminals for easy connection. The coils are stored in a clear plastic box.

Resistance Substitution Box is a convenient instrument for determining the desired resistance values in circuits under design or test. This resistance substitution box has 12 different values 100 ? , 220 ? , 470 ? , 1 k? , 2 k? , 4 k? , 10 k? , 22 k? , 47 k? , 100 k? , 220 k? and 470 k? . All resistors are precision 1% resistors and are of 1 watt rating. Selected resistor can be attached in any circuit with 4 mm two red safety sockets.

A range of units where a highly stable resistance coil is placed inside a plastic box. Connection are made via 4 mm terminals. Accuracy ± 1%.

Consists of a chrome plated brass resonance tube 100 cm long, brass reservoir 250 ml and a meter scale mounted on a metallic stand. With rubber tubing.

To measure gas evolved or absorbed by living materials or tissue extracts. A respirometer bulb with a small water reservoir at the bottom and hollow ground glass stopper at top in the neck with a hole which can be closed or opened by turning the stopper, a graduated burette opening out of the bulb which connects to a leveling tube via a rubber tubing. Respirometer chamber 50 mm dia, burette 180 x 20 mm graduated 0 to 25 ml and 100 to 75 ml, with special clamp for fixing to a 12 mm dia rod.