1、Supports measuring D battery, C battery, AA battery, AAA battery, N battery, 9V block battery, and button cell. 2、This battery checker will accurately display whether the battery is in a bad, weak or good voltage state. 3、Made of high quality insulating ABS material, the checker can isolate outside interference for more accuracy. 4、With small size size and light weight, the ergonomic battery tester allows for easier carrying and testing. 5、Very durable for long-term using, an essential household tool to keep on all batteries conditions. Item Type: Battery Tester Product Material: ABS Measurable Batteries: D Battery, C Battery, AA Battery, AAA Battery, N Battery, 9V Block Battery, 5.4mm / 0.2in (Approx.) Height Button Cell. Product Battery: 1 x LR44 button battery(not included) 1 x Battery Tester