Ulincos Digital Multimeter UT33D Amp/Ohm/Volt Meter Multi Tester It can measure AC/DC voltage, DC current, resistance, continuity, diode, square wave output With function of data hold, and a backlit LCD with large digits for visibility in dimly lit areas As a general measurement tool and widely used in the school, laboratory, factory and other social field Palm size design makes this a very portable multimeter and always handy for use Over load protection: Use the PTC protection circuit for Resistance, and frequency measurement