The battery tester is a compact device that allows you to check in a very simple and quick way whether the batteries or rechargeable batteries we use are operational (voltage measurement); Type (size): 1.5 V LR3 (AAA), 1.5 V LR6 (AA), 1.5 V LR14 (C), 1.5 V LR20 (D), 9 V 6LR61, Coin Batteries ;