SMAKN&reg; Flat Plug 100-300V AC 110V/220V Digital LCD Voltmeter Gauge Household Factory Switch Measuring accuracy: 1.5%, 2 word Measuring range: AC 80-300V Consume power: 1W (about every 1200 hours consume 1 kilowatt-hour) The product can show the voltage of power by connecting to the plug of AC 110V/220V suitable for office, factory, laboratory, household and so on