Professional testing device for various batteries and accumulators. This compact and user-friendly tester quickly checks the energy content of the most common batteries and accumulators. Display of energy content and voltage. Within 2-3 seconds, the actual energy content of the cell is shown in 10% increments. In addition to the percentage capacity, the cell voltage is indicated in volts (V). Easy to use. The measurement is straightforward with the help of a contact pin or by simply pressing it against the designated spot.