Small and practical - Simple but effective little battery tester checker(BT-168), compact size and lightweight,easy to carry. Application: 9V Batteries: PP3、Mn1604、6F22、0.6P 1.5V：AAA、HP16、Mn2400、R03 AA、HP7、Mn1500、UM3 C、HP11、Mn1400、SP11、LR14、UM2 D、HP2、Mn1300、SP2、R20、UM1 All kinds of button cell.