dealsbattery tester for aa / aaa / c / d / 9-volt and…

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Got this a while back, works great for 99 cents.

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Definitely worth 99¢. But to be completely honest, these are crap.

That being said, they work (most of the time) good. I have 2 or 3 of these, and they stick sometimes...you just gotta slap 'em or tap 'em on a hard surface to knock the meter loose.