GODIAG GT101 4 in one DC 6-40V Circuit Tester Power Probe Relay Tester

The GODIAG GT101 4-in-One DC 6-40V Circuit Tester / Power Probe / Relay Tester is a versatile diagnostic tool for automotive electrical systems. Designed to reduce testing time and help pinpoint electrical problems quickly — in light, turn-signal, relay, sensor and injector circuits.

Main Functions

• Full circuit testing: detects open / short circuits, polarity, continuity.
• Relay testing adapter included for diagnosing relay faults.
• Fuel injector test & cleaning functionality — test injector operation, clean clogged injectors safely.
• Power probe: provide positive/negative voltage output via probe; power components directly to verify functionality.
• Large display with clear readings; long cable (20 ft) for reach; built-in flashlight for low-light work.
• Overload protection up to ~20A to safeguard both tool & vehicle circuits.

Technical Specs

• Operating Voltage: 6-40 V DC
• Weight: 1.0 kg
• Operating Temp: -5°C to +50°C; Storage: -5°C to +60°C
• Cable Length: ~ 20 ft (~6 m)
• Shell Material: ABS, environment-friendly

Product Comparison Chart

What’s in the Box

• Main GT101 unit
• Battery clip & probe + probe cap
• Fuel injector test & cleaning connectors (10mm, 12mm)
• Relay adapters & connection leads
• English manual

Use Cases

• Electrical troubleshooting in vehicles (6-40V): lights, relays, sensors, etc.
• Fuel injector diagnosis and cleaning to fix performance issues.
• Work in large vehicles where component is far from battery — long cable helps.
• Workshops needing a multi-tool for electrical diagnostics, reducing need for many individual testers.