Ensure your batteries are always ready with the Faithfull Universal Battery Tester. This user-friendly device is perfect for testing a wide variety of standard domestic and rechargeable batteries, including AA, AAA, C, D, and 9V 6F22 types. The tester features a clear analogue needle display that shows the power level of your batteries, indicating whether they are good, low, or need replacement. With an adjustable arm, it conveniently accommodates different battery sizes and folds down for easy storage. Key features include: - Analogue needle indicator for clear readings - Compatible with D, C, AA, AAA, 9V 6F22 batteries, and 1.5V button cells - Simple operation activated by the battery being tested Keep your batteries in check and avoid unexpected power outages with this essential tool. Remember to minimize test time to prevent unnecessary battery drain.