Eversame Flat US Plug AC 80-300V LCD Digital Voltmeter Voltage Measuring Monitor, AC 110V 220V Voltage Panel Power Line Volt Test Monitor Gauge Meter for Household Plug into Outlet to Measure Voltage A SAFEGUARD OF HOUSEHOLD APPLIANCES: Built in Premium LCD Digital Display with Black Character, this test can immediately detect and measure the current voltage by connecting to the switch plug or the other kind of wall socket. It allows you to check on power health of devices for preventing the low voltage damage to your valuable household appliances. WIDE MEASURING RANGE & LOW CONSUMPTION: Measuring range: AC80-300V, Consume Power: Less than 1W(about every 1200hours consume 1 kilowatt-hour).2 Prongs Flat US Plug with Compact Size Design is ideally applicable to measuring the AC voltage in family, office space, industrial and mining enterprises, etc. ADJUSTABLE POTENTIOMETER: Theres an Interior Potentiometer for accuracy adjustment. Just use screwdriver to open the outer coving and adjust the potentiometer with small size screw driver. Adjust potentiometer in counter-clockwise when its excessive voltage, but if display voltage is too low, adjust potentiometer in clockwise. VERSATILE FEATURE: This Volt meter is for more than just measuring voltage. With its soft blue backlight feature, it can be also used as a night light and a simple electrical test pen, while enabling you to view the data even in dim atmosphere. PACKAGE: 1Xvoltage meter. WARRANTY: Every item includes one year hassle-free guarantee with considerate customer service. Eversame always bear in mind that your satisfaction is our priority. For any reason you are unsatisfied with our product at any time, just feel free contact support for exchange or refund. Note: Its a must to let the children away from the product. Do avoid using the product in a damp environment.