If you want to know quickly whether a battery is good or not this is a great tool to have in your inventory and is not expensive. It's not very accurate, but if you're looking for a simple yes or no then it's fine. Pro tip: DO NOT LEAVE THIS FOR MORE THAN THE RECOMMENDED TIME LISTED ON THE DEVICE. I think it's 15 seconds, but even that's long. You are essentially holding a very hot toaster in your hands. A quick reading with the display switched off is sufficient.
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