Multifunctional battery indicator and allpurpose lithium battery voltage tester with a clear color LCD display, enabling easy monitoring of battery voltage in different lighting conditions. Low power consumption: energy efficient design that supports longlasting performance during use. Userfriendly design: plastic construction and a durable switch provide comfortable handling and reliable daily testing. Wide working voltage range: DC 10V to 100V, suitable for a variety of battery types and applications. Use scenarios Check and monitor voltage in 12V, 24V, and 48V battery systems such as solar setups, UPS units, electric scooters, and other equipment within the 10–100V range. Verify power supply outputs, DCDC converters, and battery packs during electronics projects or routine maintenance. Daily household testing of portable device battery packs and replacement cells to ensure safe and effective operation within the specified voltage range.