Circuit Tester, No. CT100

The TOPDON Circuit Tester, No. CT100, is designed to diagnose circuits across cars, trucks, and motorcycles. The tester features a clear digital voltage display with built-in loading test. It measures DC volts from 3.3V to 65V, allowing users to identify weak connections, voltage drops, and wiring faults. Additional features include a real-time digital display that offers ±0.1V accuracy from 3.3–60V and ±0.2V from 60–65V; dual-color backlighting that identifies positive and negative polarity to prevent reverse connections; audio and visual alerts to provide feedback for high voltage, overheating, and reverse polarity; an additional tone to confirm circuit continuity; and a standard 4mm banana jack for quick switching between clips.