Yosoo AC 80-300V US Plug Wall Flat LCD Digital Voltmeter Volt Panel Meter Voltage Tester Gauge 110V Voltage Measuring Monitor volt Household voltage tester Gauge Multimeter plastic It is suitable for measuring the AC voltage in many place, such as office, factory, laboratory, household and so on. It is not only a Voltage Meter, but also be a night light. LCD display with blue backlight, easy for you to view even in dim light. With this Voltage Meter, you can immediate check on power health of devices to keep your appliances safe. The biggest advantage is that when you see the current voltage is too low or too high, you can selectively turn off to run a household appliances or equipment. Connect to switch plug directly easy to use,used as a voltage meter and as a night light