National Supply Co.

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SKU: T100A|UPC: 791101403370
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The T100A 100 Amp Battery Load Tester is a compact, professional-grade diagnostic tool designed for fast and reliable testing of 6-volt and 12-volt batteries. With a simple 10-second load test, this tester quickly determines battery health and helps identify charging system issues before they lead to vehicle failure.
Designed for automotive, motorcycle, and marine applications, the tester applies a true 100-amp load and displays results on an easy-to-read multicolor analog gauge. The clear GOOD, WEAK, and BAD indicators remove guesswork, making it ideal for both professionals and DIY users.
Heavy-duty copper jaw clamps provide secure terminal contact for consistent and accurate readings, while the rugged metal housing is built to withstand regular shop use. The tester also supports charging system checks, helping detect alternator or voltage regulation problems.
Compact, portable, and simple to operate, the T100A battery load tester is an essential tool for quick diagnostics, preventative maintenance, and confident battery replacement decisions.


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Suitable for automotive metal, plastic trim, and properly prepared body panels. Always test adhesion on a small area first.
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