Faithfull Battery Tester is simple and easy to use on most types of standard domestic and rechargeable batteries. It helps to ensure the batteries are fully charged and ready for use. A simple analogue needle display indicates the power level of the batteries (good, low or replacement required). An adjustable arm allows the tester to accommodate the testing of D, C, AA, AAA, 9V 6F22 batteries and 1.5V button cells and folds down for easy storage. The tester is activated by the battery being checked. Keep test time as short as possible to avoid uneccessary battery drain. Analogue needle indicator. SET CONTAINS: 1 x Battery TesterFolds down for easy storage. Adjustable arm allows the tester to accommodate the testing of D, C, AA, AAA, 9V 6F22 batteries and 1.5V button cells. Simple analogue needle display indicates the power level of the batteries. Helps to ensure the batteries are fully charged and ready for use. Simple and easy to use on most types of standard domestic and rechargeable batteries.