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Product Description

For international customer please note:

a) Import duties, taxes and charges are the buyer’s responsibility. It is not include in the price.
b) Before you buy Please check with your post office to know if the additional fee will more than you expect.

TOPDON CT100 Automotive Circuit Tester, 5-30V Professional Load Testing, Measurement Range: 3.3V-65V, Accuracy up to ±0.1V, 12.5 ft Extends

Product Introduction:

The CT100 is a professional automotive circuit tester built for speed and accuracy. It helps diagnose electrical issues, identifies polarity, and provides clear alerts. Built rugged with a long cable and interchangeable probe, it works on various vehicles. Fast, precise results for pros and DIYers.

Product Highlights:

5-30V Professional Load Testing

Polarity Detection

Measurement range: 3.3V-65V

Accuracy up to ±0.1V

Sound Alert

Supported Models: Trucks, Sedans, SUVs, Motorcycle, RV

Product Features:

Compact, Lightweight, Easy to Use

The CT100 is compact, lightweight and easy to carry for everyday diagnostics. The 12.5-foot extended test lead gives you greater reach without constantly repositioning, while universal 4 mm banana plugs support DIY accessories and compatibility with most standard probes and clips.

Professional Load Test

The built-in professional load test function supports DC 5–30V circuits with up to 1.2A output and activates with a simple press-and-hold operation. It monitors real-time voltage drop to help identify weak batteries, poor connections, and internal circuit faults—enabling fast, accurate, and reliable diagnostics for automotive electrical systems.

DC: 5–30V Max: 1.2A

Precise Voltage Measurement

The CT100 measures 3.3–65V DC with dependable accuracy across a broad range of automotive electrical systems. It delivers ±0.1V accuracy from 3.3–60V and ±0.2V accuracy from 60–65V, helping technicians diagnose circuits, batteries, and electrical components with greater confidence.

Automatic Polarity Identification

The CT100 automatically detects positive and negative polarity using color-coded backlight indicators(red for positive connection, green for reverse connection) and clear ± symbols on the display. This instant visual confirmation helps prevent reverse connections and protects sensitive vehicle electronics during testing.

Clear Digital Voltage Readout

The high-contrast digital display shows real-time voltage and polarity clearly. The 0.1V resolution readout delivers direct, accurate data at a glance for fast, intuitive diagnosis.

Professional Audible Buzzer Alerts

Distinct audible alerts indicate startup status, reverse connection warnings, active load testing, and overvoltage or overheating conditions—allowing technicians to monitor circuit status without checking the display.

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.

Built for a Wide Range of Automotive Electrical Tasks

Tackle diverse testing and diagnostic jobs with one professional tool.

DIY Automotive Enthusiasts

Vehicle electrical system testing, battery condition checks, circuit troubleshooting, and basic wiring diagnostics

Auto Repair Shops

Daily electrical inspections, load testing, fault detection, and routine vehicle maintenance support

Technical Training & Education

Circuit principle demonstrations, polarity identification training, voltage measurement practice, and hands-on learning.

Professional Automotive Technicians

On-site vehicle fault diagnosis, fleet system maintenance, electrical verification, and in-depth circuit analysis

Why Choose TOPDON CT100?

Professional Load Test with Precise Results

Intelligent Audio-Visual Indicator System

Versatile Compatibility & Extended Reach

Package includes:

1pc x TOPDON CT100 Main Unit

Pls note
Return policy
Delivery time
Feedback
Payment
Contact us

For international customer please note:

1. All the items will be handling in 1 days after you pay the items. If you not satisfied with the items you got you can asked for the exchange and refund, return the item should be within 30 days.

2. Only accept exchange or full refund at these conditions: Quality problem, items interior faulty, and other damages not caused by customer wrong operations.

3. You can ask for resend parts or partial refund if you got items are damaged, scratched or parts missed causing by delivery.

· Item will be posted within 1 working days(except weekend and holiday) after payment was cleared or received.
· We ship orders by different courtier,such as Singapore post,Hongkong Post, China post,E-packet ,DHL,EMS E-packed and so on.
Singapore post / Hongkong Post /china post (15-20 working days)
DHL(3-5 working days)
EMS(7-10 working days)

· Item will be shipped to your Confirmed Shipping Address in Paypal. If you would like to post to other address , please timely leave us a note when making payment through Paypal. We will NOT be responsible for any delivery failure due to unclear, unconfirmed or incomplete addresses given.

· We appreciate your business, if you are satisfied with our service, please leave us a positive feedback and rate the details of the transaction (Detailed Seller Ratings) with a "PERFECT 5 STARS". Your Positive feedback is greatly appreciated and we will do the same to you.

. We want all customers to be happy. Our goal is to make sure you are a happy buyer and have best buying experience on ebay.If you are unsatisfied with our item, please contact us before leaving netural/negative feedback or leaving any 1 or 2 ratings or open any dispute and give us the opportunity to resolve the issues for you.

We only accept to make the payment by paypal,E-Check will be held until cleared.

We will send item to your Confirmed Shipping Address in Paypal.Please make sure it's correct and include phone number for delivery.If you would like to post to other address,please timely leave us a note when making payment through Paypal.

Please make payment within 3 days after bidding,or all non-pay bidders will result in a non-paymemt buyer alert from Ebay and unpaid transcation would be closed.Do not bid if you are not going to pay for the auctions, please be a serious bidder.

If you have any questions,please contact us by Ebay message . We have always been doing our best to provide the best service and reliable products

for every customer.we would be very glad to help you. We would try our best to reply to your emails as soon as possible, however, due to high volume of daily incoming emails and time zone difference, we may not be able to reply your emails immediately. We will responde you within 24 hours. Please contact us to resolve the issue before leaving negative feedback or low detail seller ratings.Thanks!

Below shows the online service time table.

The green area show the time you can get our respond immediately

If you want to ask questions but we are not on duty time just leave us message

we will reply you as soon as possible.

Thanks for visiting My Store

Pls note

For international customer please note:

Return policy

3. You can ask for resend parts or partial refund if you got items are damaged, scratched or parts missed causing by delivery.

Delivery time

Feedback

Payment

We only accept to make the payment by paypal,E-Check will be held until cleared.

If you have any questions,please contact us by Ebay message . We have always been doing our best to provide the best service and reliable products

If you want to ask questions but we are not on duty time just leave us message

we will reply you as soon as possible.

Thanks for visiting My Store