Quick Detection and Clear Readings: The BT189 Battery Tester uses a definition LCD display to provide fast, accurate testing of various battery types without needing a power supply. Its compact size makes it suitable for onthego use. Portable and Compact: The BT189 is small and lightweight, easy to carry in a bag or pocket. It supports testing button cell batteries and universal batteries, making it a practical diagnostic tool for measuring capacitance. Efficient, NoPower Testing: No external power source is required. Test batteries as needed and obtain a reliable indication of their power status for household use. Definition Display and Wide Compatibility: The BT189 features a definition LCD for clear, easytoread results. Its universal design ensures compatibility with a broad range of battery types. Use Scenarios: At home, quickly check AA/AAA and button cell batteries for remotes, toys, flashlights, and other devices. While traveling or in the office, verify battery status in calculators, watches, wireless peripherals, and small electronics. In a workshop or maintenance setting, assess inventory and swap out batteries with confidence.