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Battery/Alternator Tester

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Don't let a dead battery or alternator leave you stranded (usually in bad weather or out in the middle of nowhere). This compact tester warns you of trouble beforehand—just plug it into your cigarette lighter, and the easy-read lights show battery charge (charged, recharge, dead) and alternator condition (too high, normal, too low). 3 3/4" l x 2 3/4" w x 1" d.