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Description: 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 design or test trimming are excellent applications. ? Features: ? Design based on resistors series theorem. 1/2 watt tolerance +/-1% SMD resistors. High quality FR4 glass fiber PCB. With spare parts 7 pieces jumper caps Programmable Resistance: 0 to 9,999,999 ohm, 1 ohm per step. Resistance Tolerance: +/-1% Rated Power: 1/2 Watt. Max. Working Voltage: 200V. ? Package included: ? 1 x 1R - 9999999R Seven Decade Programmable Resistor Board Step 1R 1% 1/2 Watt