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Test rechargeable and alkaline batteries Works for everyone: AAA, AA, C, D, 9V batteries and lithium-ion button cell Simple operation in 3 easy steps: 1) Select the voltage range (1.5V, 1.2V or 3.0V depending on the type of battery used, 2) Pull the orange tray outward and insert a battery in the correct polarity direction of the tester, 3) Drawer closed for positive connection and the LED will display voltage and resistance levels. Remove the battery when the test is complete. Multiple types: select 1.5V for AA, AAA, C and D alkaline batteries; Select 1.2V for AA, AAA, C and D rechargeable batteries; Select 3V for lithium button cell Touch contacts on the left side of the tester for 9V battery, Manufacturer: La Crosse Technology, Ltd.