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Many of the sensors found in modern day cars are resistor typed. Resistor type sensors are such sensors that change their resistance when the physical value they control has changed. Anyone who has ever worked in auto diagnostics has come across the necessity of having a suitable resistance, in order to check the efficiency of a sensor or the whole system that includes the sensor.

An Automotive Resistor Substitution Box is a unit containing resistors of many different resistance values, with 3 mechanical switches which allow any one of various discrete resistances offered by the box to be dialed in. This automotive type box offers a convenient way of selecting and quickly changing a resistance, without needing to attach resistors one by one or even stock each value.