TOPDON CT100

Fast. Accurate. Built for Real-World Diagnostics.

The CT100 Professional Automotive Circuit Tester is designed to help technicians and DIYers diagnose electrical issues faster, with greater confidence and less guesswork. Whether you're tracing wiring faults, verifying voltage, identifying polarity, or performing load tests, the CT100 delivers reliable results every time.

Featuring both audible and visual indicators, the CT100 provides instant feedback to help you quickly pinpoint problems and keep repairs moving. Its rugged construction, oil-resistant cable, and interchangeable probe and alligator clip are built to withstand demanding shop environments while offering the flexibility needed for a wide range of testing applications.

From passenger vehicles and heavy-duty trucks to RVs and EVs, the CT100 is the go-to diagnostic tool for electrical troubleshooting.

Key Features

• ✔ Quickly identifies voltage and polarity
• ✔ Performs accurate circuit load testing
• ✔ Audible and visual alerts for instant feedback
• ✔ Rugged, professional-grade construction
• ✔ Long oil-resistant cable for extended reach
• ✔ Interchangeable probe and alligator clip
• ✔ Compatible with cars, trucks, RVs, and EVs
• ✔ No complicated setup required