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The indicator line will show if the battery is good or not. If it's green it's good, if it's yellow it's low, if it's red it's dead. To test these CR2032 batteries you want to use the smaller display chart on the bottom that says "Button Bat".
When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.