Retrace Relay Operate/ Release Voltage Tester works on an input power of 230V with a frequency of 50Hz and dimensions of 145mmX 390mmX 300mm that is designed for testing of the DC electromechanical relays. The Voltage Tester uses microprocessor based circuitry and simplified component layouts that can test relays from 3V to 24V DC coil voltages. The Voltage Tester has no moving parts like potentiometers; variacs etc and increases the reliability of the system and reduces the down time. Retrace Relay Operate/ Release Voltage Tester displays the actuating voltage through a digital panel meter after pressing the operate button and after the relay actuates, pressing the release button will release it and the release voltage can be read on the DPM.