New Watch Battery Tester. This is a new battery tester. Will test AAA, AA, D, 9 volt, 12 volt, 6 volt and 3 volt lithium batteries. Can test alkaline, carbon-zinc, silver oxide, lithium, nickel cadmium and mercury batteries. It measures approximately 3 7/8" x 2 1/2" (98 x 63.5 mm).