I tested a brand new battery and it turned out to be bad. Both probe leads are cheap extension cords. 14 g two-wire line The voltage drop across the measuring lines alone leads to incorrect measured values when testing under load. Luckily I have spare parts for this tester on hand. Do not return for a refund. Meter is OK. The test clamps are suitable. Internal wiring nut. The on/off switch is wired as a polarity reversing switch. If you have the cable and the know-how, then the parts are worth it.
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