... Battery Tester. Every home should have this unique electrical accessory on hand because it so versatile. Tests all AAA, AA, C, D ... , 9V and button batteries, whether general-purpose, alkaline or rechargeable. Portable battery, bulb & fuse ... office. Simulated load test to check if battery will work in use. Use it to ... component is in open circuit.Power:9V battery (6F22)Dimensions(W×L×T):66×150 ...