Review on Dlyfull LCD Battery Tester - Universal Checker For AA AAA C D 9V CR2032 CR123A & More, 2X AAA Batteries Included by Marcus Freeman

I can't say enough good things about this battery tester. It works as described and I keep it handy in my battery drawer and test any batteries before discarding them into my 'dead battery bin'. If a device uses more than one battery, sometimes it's just one battery that's dead and now it's so easy to find out. When I first got it, I tested all batteries I was going to throw away (I had a whole bin full) and more than half was still usable. I use batteries that are testing as weak but not completely dead to power my wireless mouse and I am still getting a lot of life out of them. Sometimes I find a lonely battery laying around the house and I don't have to guess - it takes me a few seconds to find out if it's good or not. This tester is saving me a lot of guesswork, batteries (and money). Love it.