About this item Easy to readEasy to read, the number indicates the power level, fast and accurate, save your time Prevent waste You can simply test the battery voltage to determine whether the battery capacity is low or high, which prevents us from wasting very good batteries by throwing the good ones away Easy to carry Tester portable battery pack, small button battery, compact size and lightweight, easy to carry Capacity TestTest your battery capacity in seconds, the tool can tell you if your battery is good, low or need to be replaced Perfect CompatibilityPerfect compatibility, test different types of batteries, like CR2032 LR44 L736 6F22 9V AAA AA DC 18650 16340 14500 10440 and other batteries