Digital Panel Meter AC Frequency LCDThe meter is ideal for use in monitoring power lines and output frequencies of portable AC generators that may drift and run at frequencies that are too high or too low causing generator, tool, and equipment damage. Product DescriptionFrequency Range: 10 Hz – 199.9 Hz Accuracy: 0.1 Hz Display: LCD Backlight Color: Blue Input Voltage: 80 Volt AC – 300 Volt ACDimensions: 79mm (W) x 43mm (H) x 31mm (D)Hole Size: 76mm x 39mm Phoenix style screw terminal connectionsDoes Not Require a Power SupplyMFGD69-80G