V200 Electrical System Circuit Tester Functions: 👍 Power injection, measuring, ground testing, polarity checking, continuity testing and component activation. 👍 Read the AVO meter, voltage, current, and resistance. 👍 Energize the electrical components, such as the cooling fan, relay etc. 👍 Activate the components 👍 Determine the positive, negative and open circuit. 👍 Test the bad ground contacts, follow and locate short circuits without wasting the fuse. 👍 Test the continuity of the power switch, relay and diode. 👍 Protect the tool from overload. 👍 Allow you to work in the dark area by using the built-in head light. 👍 Test along the vehicle by the long cable.