4pcs Voltage Test Monitor, Plug AC 80-300V LCD Digital Voltage Meter, 110V 220V Voltage Panel Power Volt Test Monitor Gauge Meter.

Constructed from good quality material, impact resistant, eco-friendly and flame resistant.Mini size and light weight, portable to transport and store.
This measuring voltage range of plug-in voltage monitor is AC 80-300V(110V, 220V), low consumption.
Designed as a flat plug, plug-in design, this volt tester can immediately detect and measure the current voltage by connecting to the switch plug or wall socket.
Adjust the potentiometer counter-clockwise when it's excessive voltage; if the displayed voltage is too low, adjust the potentiometer clockwise.LCD digital display with blue backlight, clear and convenient for you to view the data even in a dark room.
It helps to check on power health of devices for preventing the low voltage damage to your household appliances.Widely apply to measuring the AC voltage in family, office, industrial etc.