M2 AC Voltmeter. Monitors AC Voltage on large, bright display. Accurately measure and monitors the voltage of your AC system. (measures 2 independent circuits or 1 double phase circuit). Features:. Auto-dimming, bright OLED display is easy to read. Easy to adjust. 92dB alarm on all models. Isolated MOSFET relay. Specifications:. Meter: Voltage. Function: 50 to 250V. Resolution: 1V AC. Alarms: High/Low Voltage. Display Size: 55mm x 28mm. Input Voltage: 7-70V DC. Maximum Power Consumption: 1.00 Watt. Minimum Power Consumption: 0.3 Watt. WARNING: This product can expose you to chemicals including di(2-ethylhexyl)phthalate (dehp) which is known to the State of California to cause cancer, birth defects or other reproductive harm. For more information go to P65Warnings.ca.gov.