The Thexton Circuit Energizer, No. 852, designed to help technicians diagnose motors, actuators, solenoids and more. This tool uses a 12V power source that most technicians already have, the company says. The tool allows users to disconnect a component from the circuit and test it independently. The tool includes a set of Female 2.8mm terminal leads, set of Female .250" Faston terminals, two alligator clips, and red and black back probes.