Elenco Resistance Substitution Box | Resistance Range From 1? To 11,, 1/2 Watt Product Description The RS-500 resistance substitution box is a convenient instrument for determining the desired resistance values In circuits under design or test. The resistance obtainable is from 1 ? to 11, 111, 110 ? in 1 ? steps. All resistors are precision 1% resistors. From the Manufacturer 1% 1W Resistor Substitution Box Model RS-500 - The RS-500 Resistance Substitution Box is a convenient instrument for determining the desired resistance values in circuits under design or test. The resistance obtainable is from 0 omega to 11,111,110 omega in 1 omega increments. All resistors are 1% precision, 1 watt resistors. Determine desired resistance values in circuits under design or test Resistance obtainable is from 1 Omega to 11, 111, 110 Omega in 1 Omega increments All resistors are 1% Precision: 1?- 40k?- 1 Watt/ 100k?- 4M?- 1/2 Watt Sturdy construction will keep this handy tool ready for many years of use For almost 50 years, Elenco has been using their strong engineering and design skills to develop reliable, affordable electronic test equipment, tools, and educational kits