Power Probe 3 Circuit Tester — Power/Ground Supply & DVM, Red, 12–24V, 20 ft Cord

The Power Probe III Circuit Tester (PP3CSRED) is a handheld diagnostic tool that safely supplies power and ground while measuring voltage to quickly locate automotive electrical faults.

Designed for professional technicians and serious DIYers, the Power Probe III combines a power/ground source with diagnostic functions so you can test components, backfeed circuits, and verify wiring integrity without dismantling assemblies. The tool works on 12–24 VDC systems and arrives with a 20-foot cord and battery hookup clips, making it practical for use across cars, trucks, and off-road vehicles.

How does the Power Probe III help me find a bad electrical connection?

The Power Probe III lets you inject power or ground and monitor circuit behavior while you probe connectors and wiring. It pinpoints opens, shorts, and poor grounds faster than swapping parts or tracing wires blindly.

• Use the probe tip to apply fused power or ground to components for functional checks.
• Built-in Digital Voltmeter displays system voltage for immediate comparison.
• Audible circuit monitoring signals changing conditions while you work hands-free.
• Min/Max capture helps identify intermittent voltage drops under load.

Can I safely power components with this tester during diagnostics?

Yes — the Power Probe III is designed to provide a controlled power or ground source for component testing, allowing you to exercise relays, motors, lamps and sensors without relying on vehicle switches. Always follow safe testing practices and the tool’s fuse protection to avoid damage.

• Fused outputs reduce risk when backfeeding circuits for component operation checks.
• Auxiliary ground and standard 4mm banana jack let you connect accessories or test leads.
• 20-foot cord and battery hookup clips enable remote access to hard-to-reach areas.

What electrical measurements and features does it include?

The unit integrates a Digital Voltmeter with Min/Max recording, audible circuit monitor, and a banana jack for additional test connections, giving you essential data without hauling separate meters. These features streamline troubleshooting by combining measurement, monitoring, and power delivery in one handheld instrument.

• Digital Voltmeter for quick voltage checks on 12–24 VDC systems.
• Min/Max function captures transient drops or spikes during testing.
• Audible monitor alerts you to changing circuit conditions while probing.
• 4mm banana jack with auxiliary ground for attaching external probes or leads.

How portable and durable is the Power Probe III for shop and field work?

Built as a handheld tool with a long cord and sturdy hookup clips, the Power Probe III is meant for repeated use in busy shops and roadside repairs. The cord length and reliable connectors make it easy to reach components in cramped engine bays or underneath the vehicle without moving the tester repeatedly.

• 20-foot cord provides excellent reach for most diagnostic situations.
• Battery hookup clips and rugged probe housing stand up to workshop use.
• Works across 12–24 VDC systems — suitable for cars, trucks, and equipment.

Who this tool is for: technicians, mechanics and experienced DIY enthusiasts who need a compact, feature-packed device to diagnose and isolate electrical problems quickly. If you routinely test sensors, relays, switches, wiring harnesses, or need to backfeed components during troubleshooting, the Power Probe III offers the combined measurement, monitoring, and power delivery features to speed diagnosis and reduce guesswork.