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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 ta...
Reviews
4.8
9 ratings
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Works good
Very nice product. You can add whatever leads you want thanks to standard banana plugs. The readout is spot on in accuracy. The load test works pretty slick. I haven't really used it, but from what I see it will be a nice tool at a great price.
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Ron · May 28, 2026
Circuit tester
It is convenient one small tool and you can test power ground 5 volt reference load test the circuit. I work on transit buses we have 12 & 24 volt system on the buses it really is an awesome tool. Once again Topdon you have made a great tool.
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Ronald · May 22, 2026
CT100
Initial unboxing the unit has a nice interface but lacking in cord thickness in my opinion . Real world , The unit works very well actually more than expected . I feel like I can use my home made tools just as easily but it is a nice addition to my dozens of other test lights . Make the cord fatter as techs we really abuse these types of tools and you would have a bigger win in my opinion .overall it is worth the money
