Tried of rummaging through your stack of batteries looking for ones that still have juice? With the JuiceMeter portable battery tester you can easily determine which have juice. Simply connect your AA, AAA, C, D, N, 9 volt or even a 1.5 volt battery to the negative and positive poles of the battery tester and the easy to read gauge will automatically let you know if that battery has juice or is empty. Keep the battery tester on your keychain or conveniently store this handy compact device in just about everywhere. Now you can be sure that your gadgets, games, cameras and toys stay powered.