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It can quickly test the capacity of your battery without complex steps. No battery required, the battery level sensor works without batteries. Suitable for lithium battery test, 1.2V-4.8V and 9V battery test. Suitable for CR2032 LR44 L736 6F22 9V AAA AA D C 18650 16340 14500 10440 Directly display the measurement result, easy to read and convenient to use.