Topdon Auto Circuit Tester with Load Test, LCD, Polarity Alerts, CT100
5 Great reasons to buy from us:
Topdon Auto Circuit Tester with Load Test, LCD, Polarity Alerts, CT100
Diagnose electrical issues faster and with more confidence using the Topdon CT100 Auto Circuit Tester. Built for technicians, DIY mechanics, and anyone who wants reliable results, this handy tester helps you quickly check circuits, identify polarity, and perform load tests with clear feedback on an easy-to-read LCD display.
Whether you're tracking down wiring faults, testing connections, or verifying power and ground, the CT100 gives you the information you need to work smarter and save time.
Key Features
- Load Test Function – Helps verify circuit performance under load for more accurate diagnostics.
- LCD Display – Clear, convenient readout for quick interpretation while you work.
- Polarity Alerts – Instantly identify positive and negative polarity to avoid guesswork.
- Automotive Electrical Troubleshooting – Ideal for checking wiring, connections, and circuit condition.
- Compact, Practical Design – Easy to handle in the garage or on the go.
Why You'll Want It
Electrical problems can be frustrating and time-consuming. The Topdon CT100 simplifies the process by giving you fast, dependable insight into your vehicle’s circuits. That means less trial and error, quicker repairs, and more confidence every time you test.
Perfect For
- Professional auto technicians
- Home mechanics
- Garage and workshop use
- Fast electrical diagnostics on cars and other automotive systems
Get the dependable testing power you need with the Topdon Auto Circuit Tester with Load Test, LCD, Polarity Alerts, CT100—a smart addition to any diagnostic toolkit.
California Proposition 65 Warning
⚠️ WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov
Estimated between and
Will usually ship within 1 business day. Drop Ship will ship within 2 days.
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Please allow 3 to 8 days for your order to arrive. We stock most of our products and ship daily. This means there is minimal delays in your order. We also drop ship from multiple warehouses, this may take up to 2 days shipping. You will be notified with tracking information once product ships. Overnight shipping is available for an additional cost. Please contact us for information before placing an order. |
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Returns are easy, simply contact us for a returns number and send your item to our returns center for fast processing. We'll get you a replacement or refund in a snap! |
Returns are easy, simply contact us for a returns number and send your item to our returns center for fast processing. We'll get you a replacement or refund in a snap!
We insist that you love everything you buy from us. If you're unhappy for any reason whatsoever, just let us know and we'll bend over backwards to make things right again.
Ordering from Rocklands is 100% safe and secure so you can rest easy. Your personal details are never shared, sold or rented to anyone either.
Topdon Auto Circuit Tester with Load Test, LCD, Polarity Alerts, CT100
Diagnose electrical issues faster and with more confidence using the Topdon CT100 Auto Circuit Tester. Built for technicians, DIY mechanics, and anyone who wants reliable results, this handy tester helps you quickly check circuits, identify polarity, and perform load tests with clear feedback on an easy-to-read LCD display.
Whether you're tracking down wiring faults, testing connections, or verifying power and ground, the CT100 gives you the information you need to work smarter and save time.
Key Features
- Load Test Function – Helps verify circuit performance under load for more accurate diagnostics.
- LCD Display – Clear, convenient readout for quick interpretation while you work.
- Polarity Alerts – Instantly identify positive and negative polarity to avoid guesswork.
- Automotive Electrical Troubleshooting – Ideal for checking wiring, connections, and circuit condition.
- Compact, Practical Design – Easy to handle in the garage or on the go.
Why You'll Want It
Electrical problems can be frustrating and time-consuming. The Topdon CT100 simplifies the process by giving you fast, dependable insight into your vehicle’s circuits. That means less trial and error, quicker repairs, and more confidence every time you test.
Perfect For
- Professional auto technicians
- Home mechanics
- Garage and workshop use
- Fast electrical diagnostics on cars and other automotive systems
Get the dependable testing power you need with the Topdon Auto Circuit Tester with Load Test, LCD, Polarity Alerts, CT100—a smart addition to any diagnostic toolkit.
California Proposition 65 Warning
⚠️ WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov
Estimated between and
Will usually ship within 1 business day. Drop Ship will ship within 2 days.
![]() |
Please allow 3 to 8 days for your order to arrive. We stock most of our products and ship daily. This means there is minimal delays in your order. We also drop ship from multiple warehouses, this may take up to 2 days shipping. You will be notified with tracking information once product ships. Overnight shipping is available for an additional cost. Please contact us for information before placing an order. |
|
![]() |
Returns are easy, simply contact us for a returns number and send your item to our returns center for fast processing. We'll get you a replacement or refund in a snap! |
Returns are easy, simply contact us for a returns number and send your item to our returns center for fast processing. We'll get you a replacement or refund in a snap!
We insist that you love everything you buy from us. If you're unhappy for any reason whatsoever, just let us know and we'll bend over backwards to make things right again.
Ordering from Rocklands is 100% safe and secure so you can rest easy. Your personal details are never shared, sold or rented to anyone either.

