Description: 【Watch Repair Tool】: This is a button supply tester, specifically designed for the most commonly used watch batteries of 1.5v and 3v. It's an essential tool for anyone who needs to check the health of their button supply 【Material & Size】: Made from premium ABS plastic, this button cell battery checker is built to long term use. Its compact size of 5.4 cmx2.7 cmx10 cm/2.13 inchx1.06 inchx3.94 inch makes it easy to carry around and store 【Functionality】: The electronic measuring device tester tool is for most 1.5v and 3v button supply, providing an indication of the battery's by simply placing the button supply side down into the correct size socket 【Easy to Read Results】: The small battery checker displays three result areas representing three conditions with red area indicates that the battery is nearly depleted, yellow area shows that the battery has been used but still has current, while green area signifies a healthy or full state of the battery 【Package Includes】: Each purchase comes with 1 watch tester meter tool, great for watchmaker, home use for watch repairing, maintenance, etc Specification: Material: ABS Plastic Size Chart: 5.4 cmx2.7 cmx10 cm/2.13 inchx1.06 inchx3.94 inch Package Includes: 1 Watch Tester Meter Tool Note: Please allow slightly errors 1-2cm differences due to manual measurement.