Test Your Battery Without Even Opening the Watch!Few things are more frustrating than dealing with replacing or testing a watch battery, and the Renata Watch & Battery Analyzer is perfect for dealing with the problem quickly and easily. Without even removing the battery, a watch can simply be placed upon the tester and the gauge will let you now how much charge the battery has and if the watch needs battery replacement or repair. The tester can also test the batteries alone, so you can make sure batteries are fresh before they are replaced.Compatible With Almost Any Battery Powered WatchThe Watch & Battery Analyzer is compatible with every common type of watch battery available.The Analyzer will test Silver Oxide, Alkaline and Lithium chemistry batteries. On top of that it will test batteries of either high or low discharge rate and give an accurate reading on how much power is left in each one. Features: Tests both watches and batteries Alkaline, silver oxide and Lithium accepted Automatic shut-off function Powered by 2 CR2430 Batteries