Works as advertised. Saved me $180 when I thought my boat battery was dead. It's nice to have in the garage if you think you've got a bad battery and no other problem. It performs load tests much more efficiently than my old battery tester which had a coil that got very hot when you tested the battery under load. This takes a little longer to test, but stays cool and puts all the information on an easy-to-read screen.
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