Power Probe PP401AS Power Probe 4 Automotive Circuit Tester, Colour LCD Menu, Supplies Power/Ground, Multi-Mode Diagnostics (Injector, Ohmmeter, Continuity), AC-RMS/Frequency/Pulse Width, 12–24V

• Advanced Power Probe circuit tester that supplies battery voltage or ground to activate components, with clear audible and visual feedback to speed up functional testing on and off the vehicle.
• Multi-function diagnostics in one tool: voltage and polarity testing, continuity checks, testing lights and connections, plus component activation to help pinpoint faults without swapping meters.
• Signal and circuit modes for deeper troubleshooting: fuel injector test mode, frequency mode, ohmmeter feedback, and open & short modes for tracking circuit conditions during repair work.
• Built for workshop conditions with an easy-to-read colour LCD and intuitive menu navigation, plus active LED lighting to illuminate the workspace while probing.
• Designed for 12–24V systems and includes a self-resetting thermal 8 amp circuit breaker plus bad ground indication to help check ground contacts and reduce the risk of overload during testing.

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. The large LCD color display makes viewing live test information and mode selection simplified in even direct sunlight or complete darkness. The Power Probe IV is the next generation of Power Probe Circuit Testers. Now loaded with powerful multi-meter functions, advanced diagnostic test modes, an easy to read color LCD display and a new rugged water and dust resistant housing, the Power Probe IV is designed to give you years of trouble free testing, even in the most demanding work environments. The Power Probe IV is connected to the battery, you can apply battery power or battery ground directly to the tip of the tool. You can energize and activate components to verify their correct operation. This is real dynamic component testing and the only true way to test an active component.