Demeras Digital Battery Tester,Universal Battery Checker for AA AAA 9V Battery Checker Tester for Small Batteries Button Cell

【SAVE BATTERIES】You can simply test battery voltage to determine whether the capacity of the battery is low or high. It won't directly detect the battery capacity precisely. This will keep us from wasting perfectly good batteries by throwing out good ones. 【SIMPLE BUT EFFECTIVE】Measureable battery various button batteries, AA, AAA, 9V square battery and rechargeable battery, etc.Compact size and lightweight, portable effective battery tester, a must buy for anyone who uses regular. 【EASY TO USE】Multi-level fixed battery card slot for battery measurement of various specifications.Can measure whether the battery is fully charged.Easy-to-read , digit indicates power level.Can quickly test the capacity of your battery. 【PERFECT FOR HOME USE】Great small tool can tell you if your battery is good, low, or needs to be replaced. A must buy for anyone who uses regular or rechargeable batteries on a regular basis.This is a must-have tool in your life to help you measure battery power. 【NOTE】Require battery to operate.Please confirm the positive and negative poles of the battery before testing, otherwise putting the battery in reverse will cause it to be unable to be inserted or the value of the test will be wrong.