Watch Battery Tester Button Cell AA AAA D 9 Volt Tool 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)