The Resistance Decade Box is ideal for testing automotive sensors and circuits; just insert the Decade Box in place of the sensor and dial in the resistance value that you would like to apply to the circuit. Once the resistance is adjusted properly; check the voltage of the circuit with a DVOM, scope, or scan tool. When checking sensors such as variable reluctance sensors; insert the Decade Box across the two leads of the sensor and set the resistance for about 1000ohms. Now check the sensors output with a scope to see if the voltage amplitude is correct. The Resistance Decade Box is quick and easy to use in many different automotive applications and is a must have tool for the automotive electronic technician.