Features Step accuracy 1R. for educational experiments, electronic engineering designs or test trimming are excellent applications. Can flexible and quick setting resistance range from 1R to 9999999R. Programmable Resistance: 0 to 9,999,999 ohm, 1 ohm per step. This is "resistance substitution box" good low‑cost alternative solution. Maximum working voltage DC200V, resistance tolerance: +/‑1%. Specification: Condition: 100% Brand New Item Type: Resistor Board Material: Glass Fiber Size: Approx. 9 x 3.5 x 1cm / 3.5 x 1.4 x 0.4in Specification: 1/2 watt tolerance Programmable Resistance: 0 to 9999999 ohms, 1 ohm per step. Resistance Tolerance: +/-1% Rated Power: 1/2 watt. Maximum Working Voltage: DC200V Package List:1 x Resistor Board Package List 1 x Resistor Board