Have you filled your drawers with old batteries and don't know which ones are useful and which are not? With this tester, you can check how much energy your battery has. Suitable for classic 1.5 V and 9 V batteries as well as flat (cell) batteries - With this tester, you can test the following types of 1.5 V batteries: AAA, HP16, MN2400, R03, AA, HP7, MN1500, UM3, C, HP11, MN1400, SP11, LR14, UM2, D, HP2, MN1300, SP2, R20, UM1 - With this tester, you can test the following types of 9 V batteries: PP3, MN1604, 6F22, 006P - It has an LCD screen, which shows the voltage reading of the battery - For 1.5 V batteries, if the reading is 1.5 ~ 1.28 V the battery is good - For 1.5 V batteries, if the reading is 1.27 ~ 1.15 V the battery is low energy - For 1.5 V batteries, if the reading is below 1.14 V the battery needs replacement - For 9 V batteries, if the reading is 9.0 ~ 7.8 V the battery is good - For 9 V batteries, if the reading is 7.7 ~ 6.0 V the battery is low energy - For 9 V batteries, if the reading is below 5.9 V the battery needs replacement - The battery testing duration should be as short as possible to avoid unnecessary battery discharge