UNI-T UT132A 2.0"LCD 1999 Count AC/ DC Voltage Current Resistance Electrical Tester Ammeter Voltmeter Palm-Size Digital Multimeters Functions: Square Wave Output(About 50Hz), Diode, Transistor, Low Battery Indication, Data Hold Max. Display: 1999 LCD Size: 2.0" Input Impedance for DCV ( Around 10M)