I bought two of these to test the batteries in our golf carts. When I thought about the purchase, I saw the designation "6 -12 volts". Since my wife's car has eight 6 volt batteries, it works well. However, my hunting cart that I have at my campsite has six 8V batteries and will not work properly with 8V batteries. It was my mistake but it's too late to return a brand new tester useless to me. The OTC should clearly state that this only applies to 6V or 12V batteries. live and learn
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