TOPDON CT100 Automotive Circuit Tester

Automotive Circuit Tester For Fast Electrical Checks

Electrical faults can waste time when a technician has to prove whether a circuit has power, whether polarity is correct, or whether a connection is dropping voltage under load. The TOPDON CT100 is a compact automotive circuit tester built to make those everyday checks faster and clearer.

The CT100 combines voltage testing, polarity indication and load testing in one handheld tool. It helps technicians and capable DIY users check fuses, connectors, wiring, power feeds and vehicle electrical circuits without relying only on guesswork or a basic test light.

Its digital display supports DC voltage checks across common vehicle systems, while audible and visual alerts help make polarity and fault conditions easier to identify. The long test lead and interchangeable probe and clip make it useful around cars, vans, trucks, RVs and other vehicle electrical systems.

Choose the CT100 when the job needs a practical electrical tester for routine maintenance, accessory installation and fault tracing. It is not a scan tool, but it is a useful companion for electrical diagnosis before deeper module testing is needed.

CT100 Electrical Testing Highlights

The CT100 is aimed at practical circuit checks where fast polarity, voltage and load feedback can save time.

• Automotive circuit tester for voltage, polarity and load checks
• DC voltage testing range from 3.3V to 65V
• Load test function for checking weak connections and voltage drops
• Audible and visual alerts for clearer diagnostic feedback
• Battery-free operation powered from the tested circuit
• Supplied with probe, alligator clip, adaptor, carrying bag and quick guide