TOPDON CT100 Automotive Circuit Tester Supports 5-30V Professional Load Testing Supported Trucks/ Sedans/ SUVs/ Motorcycles/ RVs
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Product Description
The TOPDON CT100 is a professional automotive circuit tester designed for speed and precision. It enables you to diagnose electrical issues, identify polarity, and receive clear indications. Rugged and featuring a long cable and interchangeable probe, it is suitable for a wide range of vehicles. It delivers fast, accurate results, making it ideal for both professionals and DIY enthusiasts.
TOPDON CT100 Automotive Circuit Tester
TOPDON CT100 Description:
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 an interchangeable probe, it works on various vehicles. Fast, precise results for pros and DIYers.
Why Choose TOPDON CT100?
- Professional Load Test with Precise Results
- Intelligent Audio-Visual Indicator System
- Versatile Compatibility & Extended Reach
Advantages of TOPDON CT100
- 5-30V Professional Load Testing
- Polarity Detection
- Measurement range: 3.3V-65V
- Accuracy up to ±0.1V
- Sound Alert
- Supported Models: Trucks, Sedans, SUVs, Motorcycles, RVs
TOPDON CT100 Features:
1. 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.
2. 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.
3. 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.
① 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.
② 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.
4. 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.
5. 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.
6. Built for a Wide Range of Automotive Electrical Tasks
Tackle diverse testing and diagnostic jobs with one professional tool.
① DIY Automotive Enthusiasts
Vehicle electrical system testing, battery condition checks, circuit troubleshooting, and basic wiring diagnostics
② Auto Repair Shops
Daily electrical inspections, load testing, fault detection, and routine vehicle maintenance support
③ Technical Training & Education
Circuit principle demonstrations, polarity identification training, voltage measurement practice, and hands-on learning
④ Professional Automotive Technicians
On-site vehicle fault diagnosis, fleet system maintenance, electrical verification, and in-depth circuit analysis
TOPDON CT100 Specifications:
Voltage Measurement Range: DC 3.3 V to 65 V
Load Test: 5 V to 30 V (Max. 1.2 A)
Measurement Accuracy: 3.3 V to 60 V: ±0.1 V/60 V to 65 V: ±0.2 V
Measurement Resolution: 0.1 V
Working Temperature: -10°C to 50°C (14°F to 122°F)
Storage Temperature: -20°C to 70°C (-4°F to 158°F)
TOPDON CT100 FAQs:
Q1: Can I replace the probe or clips?
A1: Yes. You can use your current probes or clips, or purchase compatible accessories from other brands. The tester only works with 4 mm connector accessories.
Note: Replacing the accessory may affect test accuracy.
Q2: What should I do if the spring wire of the supplied clip is not long enough?
A2: You can extend the cable by connecting an additional wire using an adapter.
Note: This may affect measurement accuracy.
Q3: What should I do if the tester does not operate properly?
A3: Check the voltage source and connections, then test again. If the tester still does not function correctly, contact customer service.
Q4: Why is the light dim during the load test?
A4: During the load test, the tester applies current based on the measured voltage (for example, 0.6 A at 12 V, 1 A at 24 V, and up to 1.2 A at 30 V). When the voltage is low, the applied current is reduced, and the built-in lamp dims. Therefore, a dim lamp indicates low circuit or battery voltage.
Q5: Can the load test be used to determine whether a battery or circuit is weak?
A5: You can make a basic judgment by observing the voltage drop during the load test. If the voltage drops by more than 3 V under load, the battery or circuit may be weak. For a more accurate assessment, use a dedicated battery tester to check battery health, charging status, and other parameters.
Q6: Why does the screen repeatedly turn off and on, and the buzzer beep during the load test?
A6: This may occur when the current of the circuit or battery is below 0.4 A, which is insufficient to support the normal operation of the tester. As a result, the tester may repeatedly interrupt the test, causing the screen to turn off and on and the buzzer to beep. Try using another power supply or a test tool for measurement.
TOPDON CT100 Package list:
1 pc x CT100 Tester
1 pc x 2mm Probe
1 pc x Alligator Clip
1 pc x Adapter
1 pc x Carrying Bag
1 pc x Quick User Guide
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Shipping method and delivery time:
UK Shipping (No Tax) : 2-4 working days arrive. For products marked " UK Ship " and UK local customer
EU shipping (No Tax) : 5-7 working days arrive. For products marked " EU Ship " and from EU countries, if not belong to EU, need to clearance
Yodel (No Tax) : 5-7 days arrive . For products UK out of stock, and customers from UK
Yun Express ( No Tax) : 5 - 9 working days to UK, 7-14 days to other European Countries.
Yanwen (No Tax) : 5 - 9 working days to UK, 7-14 days to other European Countries, ship to all over the world, mainly for UK/EU warehouse no stock
DHL: need to clearance, 3-5 working days arrive. Used for UK/EU no stock, customers request ship this way. Need to clearance, we will declare a low price on the invoice help to clearance.
If you have any questions about the device, the price, or the payment, please feel free to contact us.
Contact Person: Elyza
Whatsapp: +86 13983755934
Telephone: +86 13983755934
Wechat: +86 13983755934
Official Email: Sales@obd2shop.co.uk
Tags: TOPDON