TOPDON CT100 Automotive Circuit Tester with Load Test 3.3-65V

TOPDON CT100 Automotive Circuit Tester with Load Test 3.3-65V helps diagnose electrical issues by watching voltage under load and verifying polarity. Safely.

Designed for both DIY enthusiasts and professional technicians, CT100 offers a practical load test that reveals issues lurking beyond a basic voltage check. When testing DC circuits in the 5-30V range, you can apply up to 1.2A of load with a simple press-and-hold action, then monitor real-time voltage drop. This approach helps identify weak batteries, loose connections, and wiring faults more reliably, reducing guesswork during electrical troubleshooting across a wide range of automotive systems.

Voltage testing covers 3.3-65V with dependable accuracy — ±0.1V from 3.3-60V and ±0.2V from 60-65V. The device automatically identifies polarity with color-coded backlight indicators—red for positive and green for reverse—and clear symbols on the display, helping prevent incorrect connections before you power sensitive electronics. Combined with a digital display and audible alerts for reverse connections and abnormal conditions, CT100 provides instant feedback during checks.

Compact and lightweight at about 30g, CT100 includes a 12.5-ft extended test lead and universal 4 mm banana plugs for versatile probes and DIY accessories. It supports automotive DC testing across wiring, connectors, fuses, lights and batteries for cars, trucks, SUVs, RVs, motorcycles, boats and more, making routine maintenance and troubleshooting faster and more reliable.

Features:

• Load test DC 5-30V circuits with up to 1.2A output for hidden issues
• Wide voltage range 3.3-65V with ±0.1V (3.3-60V) and ±0.2V (60-65V) accuracy
• Automatic polarity identification with red for positive and green for reverse
• Clear digital display with audible alerts for reverse connections and faults
• Compact 30g weight with 12.5-ft test lead and universal 4 mm banana plugs
• Versatile automotive DC testing across cars trucks SUVs RVs motorcycles boats and more