HDE Digital Alkaline Battery Tester for Small Batteries Volt Checker Tool for AA, AAA, C, D, 9v, Cell Handy digital battery tester shows when to replace batteries | Compact, easy to hold design Tests and gives accurate readings on small alkaline batteries | Great for AA, AAA, C, D and 9 volt batteries Leave out the guess work of color coding - Easy-to-read digital numbers indicate the power level on a 1.25" digital screen Rechargeable batteries are typically 1.2V when fully charged versus 1.5V for normal alkaline batteries Note: Battery tester has no internal battery, itt is powered by the battery being tested | If the battery being tested is completely dead (below 0.5V), the meter will not power up