1Portable and Efficient: Compact and lightweight, the button cell battery tester is a portable and efficient tool that makes battery testing easy and ensures that your equipment performs at its best. 2Intuitive Testing: The sound aid tester provides a clear and intuitive battery status display, instantly showing you if the battery is ready to power your sound aid. Its compact design is easy to carry around, so you'll always know what's going on. 35pcs: Equipped with five button cell battery testers, this comprehensive kit caters to your diverse battery testing needs. Its versatile design supports a wide range of coin cell batteries, ensuring you have the tools to check the status of all your devices. 4Simple and Reliable: Coin cell battery testers offer a straightforward and reliable approach to battery testing. Their practical design makes it a breeze to slot in a coin cell battery and obtain accurate readings, ensuring your devices are powered by healthy batteries. 5Efficient Battery Measurement: The button battery tester provides a quick and accurate assessment of the health of your coin cell battery. Simply insert the battery and the light will come on if the battery is charged. Its efficient operation allows you to quickly determine the battery status.