Handy testing device for quickly and easily checking whether batteries or rechargeable batteries are still operational or need to be replaced or charged. Seconds to determine and display the remaining voltage. Simple operation: Measuring is effortless by pressing or inserting into the designated spot. The batteries or rechargeable batteries are tested under load, providing a more realistic measurement result. Remaining voltage is displayed on a digital screen. Two different contact points on the device for measuring 1.5-volt and 9-volt batteries. Six different types of rechargeable batteries and batteries can be measured: AA Mignon, AAA Micro, C Baby, D Mono, 9-volt block, and button cells.