1[Quick Testing] Simply insert the battery into this button cell battery tester, and it will swiftly display the battery health status, helping you prevent unnecessary charging that may damage the battery. 2[Clear Display] This easy to use analyzer provides a clear display of the battery health status, accurately indicating whether the battery is in a poor, weak, or good voltage state. 3[Versatile Use] Capable of testing both 1.5V and 3V batteries, this button cell battery checker offers a simple yet effective solution for assessing battery performance. 4[Portable Design] Constructed from lightweight plastic material with a mini size, this battery analyzer is easy to carry and convenient for use, allowing you to test batteries anytime and anywhere. 5[Essential Tool] A great tool for watchmakers and clock repairers, this watch battery tester ensures you can determine whether a battery is good, or in need of replacement. 1 x Button Cell Battery Tester