Compact tester for testing the energy content of standard batteries and rechargeable batteries. LCD bar display shows whether rechargeable batteries need to be recharged; the residual voltage is displayed for batteries. Uncomplicated operation: measuring is child's play by pressing or inserting the device into the intended position. Determination and display of the residual voltage in seconds. Check quickly and easily whether the batteries are still ready for use or need to be replaced or charged. 13 different battery types can be measured (AA / AAA / C / D / N / E / CR123A / CR2 / CR-V3 / 1.5V / 3V / 2CR5 / CR P2). The device helps to recognise defective batteries/rechargeable batteries - thanks to the rapidly falling LCD display during measurement.