Topdon CT100 Auto Circuit Tester with Load Test, LCD & Polarity Alerts, 30 V, 1.2 Amps (CT100)

CT100 Auto Circuit Tester with Load Test, LCD & Polarity AlertsFeatures a professional load test function (DC 5–30V, 1.2A Max)Hold the button for 5 seconds to check battery and circuit load capacity, quickly identifying aging batteries, weak connections, and voltage drops for faster, more accurate repairsEquipped with a clear backlit digital display, the CT100 measures DC voltage from 3.3–65V with 0.1V resolution (±0.1V accuracy from 3.3–60V; ±0.2V from 60–65V)Delivers dependable performance for both professional technicians and serious DIY usersDual-colour backlighting (red for positive, green for negative) and on-screen ± indicators activate instantly when the probe contacts a circuitIntuitive feedback helps prevent reverse connections and protects sensitive vehicle electronics during testingBattery-free operation eliminates maintenance and downtime while improving safety during testingIntegrated protections include overvoltage alerts, overheating warnings, and component status monitoring for dependable performance in daily automotive diagnostic workColour-coded backlight indicators confirm polarity instantly, while additional alerts display overvoltage (“H”), overheating (“Hot”), and lamp abnormality (“ER1”) status—keeping key operating conditions visible at a glance during testingThe 12.5-foot extra-long test cable improves access to hard-to-reach areas without repositioning the testerUniversal 4mm banana jack connections support interchangeable probes and clips, enabling flexible testing across cars, trucks, RVs, and other vehiclesWith a 3.3–65V testing range, this versatile tester supports 12V, 24V, and 36V vehicle systems, making it ideal for cars, trucks, RVs, commercial vehicles, and morePerfect for checking fuses, verifying connector voltage, testing circuit integrity, tracing wiring issues, and diagnosing starting-related electrical faults