Attributes . The Power Probe 4 is a Multi-Use Circuit Tester with Built-In Diagnostic Power, This Tool Simplifies the Testing of Fuse Boxes, Verifies Correct Operation of Motors, Lights, Relays, Sensors, Wires, Communications Circuits and Computer Drivers, Self-Resetting Thermal 8 Amp Circuit Breaker, Multiple DC Volt Readings on the Same Display, Ohm Meter Provide Active Feedback, 12 to 24 Volt Range, Continuity Tester, Component Tester . Names