BT-168 /BT-168D Battery Volt Checker Pointer/Digital Display Battery Capacity Check Detector Universal Battery Checker Volt Measure for AA /AAA/C/D/9V/1.5V Button Cell. Features universal compatibility, comprehensive testing capabilities, easy-to-read digital display, multi-size battery testing, and convenient user-friendly design. Tests various sizes of batteries in one device, including AA, AAA, C, D, 9V, and 1.5V miniature batteries. Provides accurate readings on battery power levels, with three results: red for replacement, yellow for low power, and green for good. Lightweight and compact, requiring no external power source.