This digital battery tester checks the power level of all 1.5V and 9V batteries. It has an easy to read, color coded meter that indicates the power level. The tester provides three results: red for replace, yellow for low power, and green for good. It tests 1.5V miniature cells and can be used to test AAA, AA, C, D, and 9V batteries. The battery tester is activated by the battery being checked, so keep test times as short as possible to avoid unnecessary battery drain. The package includes one battery tester.