Quickly indicates if batteries are "good, "low or "replace"Test standard and rechargeable batteries: 9V, AA, AAA, C, D, 1.5V button typeErgonomic design is easy to holdSide cradle holds batteries in place during testingNo batteries required to operateLarge, upright display is easier to readV-shaped cradle holds batteries securely in place during testing for consistently accurate resultsHigh-quality 9V ContactsSlider is shaped for easier operation and one-handed testingCase shape contours to your hand for easy operation