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Mis1003. Resistance Substitution Box - Decade Box
Mis1003. Resistance Substitution Box - Decade Box This tool is invaluable for any mechanic that works on emission systems. The resistance substitution box also known as a decade box allows you to introduce a variable resistance into a circuit for test purposes. If you put this test box in a circuit between a sensor and the electronic control unit, you can then vary the resistance and modify the ECU's response to the sensor. If you want the car to run richer or leaner you can test with the decade box to determine the correct size resistor to place in the circuit. It is also great for testing other resistance sensative circuits such as fuel gauges. The box takes standard "banana leads" for easy use with your other diagnostic tools. Limited stock on this item.

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