The Extech MN30 True RMS AutoSensing Multimeter with Non-Contact Voltage Detector is an easy-to-use smart pocket multimeter with an AutoSensing feature that enables the meter to recognize the input and automatically switch to the correct mode of operation (i.e. Voltage to Resistance measurement). True RMS AC Voltage measurement allows for accurate readings regardless of waveforms. Built-in Non-Contact Voltage (NCV) Detector allows for quick detection of live voltage. Convenient LED flashlight illuminates dimly lit area.