Amprobe BAT-250 [4589825] Hand-Held Battery Capacity Tester . The Amprobe BAT-250 Battery Tester is designed for one-handed, comfortable and reliable battery measurements. The uniquely designed tester offers an ergonomic slider and a v-shaped side cradle to better hold batteries in place during testing and a contoured case shape that fits neatly in your hand.Testing your batteries has never been easier. Battery failure is one of the most common causes for sensor or instrument failure. The Amprobe BAT250 Battery Tester indicates the amount of charge remaining in standard and rechargeable batteries. The analog display needle moves on a color-coded, calibrated scale to quickly identify "good" (green), "low" (yellow), and "replace/recharge" (red) battery status. The BAT-250 tests 9V, AA, AAA, C, D and 1.5V button type batteries.