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The CT100 is a professional automotive circuit tester built for speed, accuracy, and everyday reliability. It helps diagnose electrical issues quickly, identifies polarity, runs load tests, and provides clear audible and visual alerts to take the guesswork out of repairs.
Built rugged with a long oil-resistant cable and interchangeable probe and clip, it works on cars, trucks, RVs, and EVs. No complicated setup—just fast, precise results for pros and DIYers alike.
Professional Load Test: Unlike basic test lights, the CT100 features 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 repairs.
Precision Voltage Testing: Equipped 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). With a wider range than standard testers, it delivers dependable performance for both professional technicians and serious DIY users.
Polarity Protection & Anti-Reverse: Dual-color backlighting (red for positive, green for negative) and on-screen ± indicators activate instantly when the probe contacts a circuit. This intuitive feedback helps prevent reverse connections and protects sensitive vehicle electronics during testing.
Safe, Battery-Free Operation: Battery-free operation eliminates maintenance and downtime while improving safety during testing. Integrated protections include overvoltage alerts, overheating warnings, and component status monitoring for dependable performance in daily automotive diagnostic work.
Intuitive Status Light Indicators: Color-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 testing.
Easy Operation & Extended Test Lead: The 12.5-foot extra-long test cable improves access to hard-to-reach areas without repositioning the tester. Universal 4mm banana jack connections support interchangeable probes and clips, enabling flexible testing across cars, trucks, RVs, and other vehicles.
Wide Vehicle Compatibility: With 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 more. Perfect for checking fuses, verifying connector voltage, testing circuit integrity, tracing wiring issues, and diagnosing starting-related electrical faults.
Note: For expedited shipping, please give us a call so we can provide a more accurate quote on shipping times and costs.
We currently ship to the United States and Canada.
Canada: Please contact us directly to place your order. Shipping to Canada must be arranged over the phone.
We strive to get your equipment to you quickly and efficiently. Please note that order processing typically takes 1-2 business days, after which we will update you with tracking information.
For larger equipment/products, please allow 2-4 business days for pick and pack preparation. Once shipped, you will receive tracking information to stay up-to-date on the status of your order.
Small items (eg. Tablets & tools) | 3-5 business days
Large items (eg. Calibration Targets and Plates) | 5-8 business days
Full calibration packages | 8-10 business days
We want to ensure you're completely satisfied with your purchase. If you need to return an item, please contact our customer service team within 30 days of purchase. A 15% restocking fee will apply to all returns. The customer is responsible for return shipping costs. Refunds will be processed once the returned items are received and inspected at the warehouse.
All package sales are final due to the complexity of shipping the equipment. The total purchase price should be paid in full before shipment. When items are passed to the shipping carrier they are responsible for delivery. The equipment is covered solely by the manufacturer's warranty. The Buyer should inspect the equipment upon receipt and notify the Seller of any discrepancies as soon as possible. Let's get calibrating!
