Universal Compatibility : Check the charge levels of various battery types including AA, AAA, C, D, 9V, and 2.5V button cells effortlessly. Portable Design : The small and lightweight build makes this battery checker ideal for travel and everyday use. Battery-Free Operation : Activated by the battery being tested, no additional power source needed. Easy-To-Use : Simply insert the battery to receive an instant readout of its condition. Accurate Voltage Measurement : Determine the remaining life of batteries accurately to avoid wastage. Effortlessly keep track of your battery health with our Portable Battery Volt Monitor, designed for the modern, on-the-go lifestyle. Say goodbye to guessing games and hello to precise, convenient battery management.