TOPDON CT100 Automotive Circuit Tester 3.3–65V

TOPDON CT100 Automotive Circuit Tester

The TOPDON CT100 is a battery-free automotive circuit tester that measures DC voltage from 3.3 V to 65 V on a backlit digital display. A load-test function and polarity indication help you find weak connections and faults quickly, on 12 V, 24 V and 36 V systems.

Key Features

• Load test: DC 5-30 V, 1.2 A maximum. Hold the button for 5 seconds to check battery and circuit load capacity, and to spot ageing batteries, weak connections and voltage drops
• Voltage testing: DC 3.3-65 V at 0.1 V resolution. Accuracy is ±0.1 V from 3.3-60 V and ±0.2 V from 60-65 V
• Polarity indication: red backlight for positive and green for negative, plus on-screen ± indicators that activate when the probe touches a circuit, to help prevent reverse connections
• No battery to maintain or replace
• Built-in protections: overvoltage alerts, overheating warnings and component status monitoring
• 12.5 ft test lead reaches hard-to-access areas without repositioning
• Universal 4 mm banana plug connections accept interchangeable probes and clips

Vehicle Compatibility

The 3.3-65 V range covers 12 V, 24 V and 36 V systems in cars, trucks and RVs. Use it to check fuses, connector voltage, circuit integrity, wiring faults and starting-related electrical faults.

Specifications

• Voltage measurement range: DC 3.3-65 V
• Load test: 5-30 V, 1.2 A maximum
• Accuracy: ±0.1 V (3.3-60 V), ±0.2 V (60-65 V)
• Resolution: 0.1 V
• Working temperature: -10°C to 50°C
• Storage temperature: -20°C to 70°C

What's in the Box

• CT100 circuit tester
• 2 mm probe
• Alligator clip
• Adapter
• Carrying bag
• Quick user guide