- Controls if batteries/rechargeable batteries are still ready for use or if they need to be replaced or charged ,- The batteries or rechargeable batteries are tested under load which provides a more accurate measuring result ,- Easy handling ,- Displays the residual voltage - Display: Analogue Display ,- Number of Batteries: 0 ,- Power Supply: Passive ,- Colour: Black ,- Testable Button Cell Batteries: None ,- Testable Round Cell Batteries: AA Mignon/AAA/Button Cells/C/D/E 2 years legal warranty only