Replaces a sliding rheostat with a programmable resistor. The resistance value can be programmed, making it a helpful tool for experiments. Eight resistance levels in series. The chain units cover the magnitudes: x0.1Ω, x1Ω, x10Ω, x100Ω, x1kΩ, x10kΩ, x100kΩ, x1MΩ. Each of magnitude is configured by a jumper cap with a coefficient of 0 to 9. The total resistance value is the sum of the selected magnitudes. Suitable for a range of variableresistor applications, including amplifier circuit configuration, DCDC power supply feedback resistor configuration, bridge circuit testing, and other lowcurrent applications. Key benefits: provides precise, repeatable resistance settings; supports a wide dynamic range from 0.1Ω to 1MΩ; enables quick adjustments during experiments; reduces mechanical wear compared to traditional sliding rheostats. Use scenarios: Configure the feedback resistor in DCDC converters to optimize regulation and efficiency. Set adjustable gain in amplifier circuits by selecting the appropriate resistance sum. Test and calibrate bridge circuits and other lowcurrent measurement setups requiring variable resistance.