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RS-500 Resistor Substitution Box (1% 1W) 0 ohm to 11,111,110 ohm in 1 ohm steps - 1% 1W Test various resistors during prototyping Ages: 13+ The Elenco RS-500 Resistor Substitution Box is a convenient instrument for determining the desired resistance values in circuits under design or test. The resistance obtainable is form 0 ohm to 11,111,110 ohm in 1 ohm steps. All resistors are precision 1% resistors.  WARNING: Cancer and Reproductive Harm-www.P65Warnings.ca.gov.