M2 AC VoltmeterMonitors 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 relaySpecifications: 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 WattWARNING: 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. Owner’s Manual (pdf)