The soldering techniques on Resistor Substitution Box Soldering Kit. The values selected for your Resistance Substitution Box were determined to be the most commonly used in modern solid-state circuits. The Resistance Substitution Box is a convenient instrument in determining the desired resistance values in circuits under design or test. The values are from 10Ω to 1,000kΩ in 24 steps. All resistors are 5% tolerance 1/2 watt. 

Dimensions: 5.1 x 2.5 x 1.8 inches.