Unfortunately I had to use this battery tester within the same week that I received it. My car died and I had to spend some of my meager unearned earnings on cabs, which I enjoyed as much as an IRS check. After charging the battery, I tested it on this machine. This confirmed that my battery was weak (maybe I needed to charge it a little longer) but was otherwise fine, and also confirmed that my car's charging system was within tolerance, albeit a bit over the top. Because it saved me the price of a new battery, it made up for its purchase price. From now on, I swear I'll look under the hood once a month, not even a year. My injured hands confirm that there is not enough space underneath. And the oil change station that changed my oil a few weeks ago couldn't test the battery as promised because there were two dry cell batteries. So my advice to you, buy this thing and use it. Instantly.
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