DIY Supplies : PlumbingCertification : CEAC80-300V LCD Digital Voltmeter Voltage Measur, Voltage Panel Power Volt Test Monitor Gauge for Measure Voltage,US PlugProtect household appliances: built in quality lcd digital display with blue back light, this voltage monitor is convenient for you to view the data on it even in night, 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 household appliancesWide measuring range and low consumption: measuring range: ac 80 - 300V, consume power: less than 1W (about every 1200 hours consume 1 kilowatt-hour), 2 prongs flat us plug with compact size design is perfect ly applicable to measuring the ac voltage in family, office space, industrial and mining enterprises, etc.Adjustable potentiometer: there's 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 it's excessive voltage, but if display voltage is too low, adjust potentiometer in clockwiseVersatile feature: this volt meter is for more than just measuring voltage, with its soft blue back light feature, it can be also applied as a light for night and a simple electrical test pen, while enabling you to view the data even in dim atmosphereWide applications: it is perfect ly applicable to measuring the AC voltage in family, office space, industrial and mining enterprises, etc.; Please keep the children away from the product and do not use the product in a damp environmentPlug Type: US Plug,it applies to Canada, India, Mexico, Thailand, Taiwan, the United States, the Philippines and so on.Colour:WhiteMaterial:plasticPackage Contents:2 * Digital voltmeterOnly the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.