Features This is "resistance substitution box" good low‑cost alternative solution. Can flexible and quick setting resistance range from 1R to 9999999R. Step accuracy 1R. for educational experiments, electronic engineering designs or test trimming are excellent applications. Programmable Resistance: 0 to 9,999,999 ohm, 1 ohm per step. 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