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Charg-Chekr Battery Tester Foolproof, dependable testing. Works at all temperatures. Accurately tests state of charge within temperature extremes of -40ø to 130ø F. Uses less than 1/4 oz. of acid. Easy to use. Easy to read. Features unbreakable rubber tip, leak-proof container and pocket protector. One ball floating 25% charge. Two balls floating 50% charge. Three balls floating 75% charge. Four balls floating - Full Charge.
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