Feature: 1. Wide Application: This machine not only serves as a battery tester for 1.5V and 3V coin cell batteries, but also can test the power supply before opening watch batteries. Various functions to meet your different battery testing needs. 2. Low Power Warning: The machine will have light signals if watch battery is low, ensuring timely replacement before watch loses synchronization. Suitable for watch repairing. 3. Efficient Watch Repair Tool: Easily detect whether a quartz watch needs a new battery or is damaged before opening the case, saving time and potential repair costs. Make your watch repairs convenient 4. Comprehensive Battery Check: This tester checks for mechanical defects and insufficient voltage levels. The tester effectively tests 1.55V silver as well as 3V lithium, and button batteries. 5. Premium Material: Button battery test analyzer is made of premium plastic, with compact and exquisite appearance, sturdy and long lasting. This practical analyzer can help you test whether your watch really needs a battery replacement. Specification: Item Type: Button Cell Battery Tester Material: Plastic Battery Type: Button Cell Battery (Shipped with built in battery) Battery Model: CR2016 Battery Capacity: 75mAh. Package List: 1 x Tester