The Resistance Substitution Box is a convenient instrument in determining the desired resistance values in circuits under design or test.
The values selected for your resistance substitution box were determined to be the most commonly used in modern solid-state circuits.
The values are from 10 to 1000k (1 meg) in 24 steps. All resistors are 5% tolerance 1/2 watt.

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Ltekonline are the manufacturers of Resistance Substitution Box Electronic and Electric Lab used to demonstrate engineering principles in Engineering Colleges, Engineering Schools and Physics Lab Experiments for Engineering Teaching Lab in Universities