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Easy to Use - identify battery status simply by the analog display needle, "good" (green), "low" (yellow), and "replace/recharge" (red) AITRIP Battery Tester for AAA AA C D 9V and 1.5V Button Cell Batteries. Suitable for a wide range of household batteries, meet your needs in daily life Compact size and lightweight, portable effective battery tester,NOTE : 1. 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 2. Don't forget: The Battery Tester is activated by the battery being checked. Keep test times as short as possible to avoid unnecessary battery drain Require on Battery:activated by the battery being checked, no battery needed for operation 4PACK Battery Tester, Universal Battery Checker Small Battery Testers for AAA AA C D 9V 1.5V Button Cell Household Batteries Model BT-168