all-sun Digital Multimeter/DMM / Multi Tester Amp/Ohm / Volt Meter/Diode and Continuity Test Pocket Size Power supplied by 2 pieces 1.5V botton cell.( Move the battery's insulating piece away before using ) It owns 3 1/2-digit LCD, with a max reading of 1999. It is easy to carry for its box-type design. Pocket size, but powerful in multi-function. It's for measuring DC/AC voltage,DC current,resistance,diode and continuity.