Main Function: Advanced socket tester for rapidly detecting whether the socket's wire connection is correct or not. Portable: With Compact size, the detector is light and convenient to use. Plugging and Playing: Designed with RCD/GFCI test button, one click to know the working state of the leakage protector. Perfect for protect your security against the risk of electric shock Bright LCD Display: With bright LCD display, the texter's data can be read easily Wide Application: Widely used for electric maintenance testing, office sockets testing, power strips testing and wall sockets testing in school, laboratory, factory and other social field. Home improvement acceptance and safety inspection, it saves you lots of time in testing problems with sockets