Features: 100% Brand new and high quality The product is a socket detector, used for socket connection status test, RCD leakage switch test, GFCI test (US gauge) Easy to operate, quickly check the safety of the socket connection Exquisite divisional design, test result display lights, double layer insulation protection, reference for test results, electrical leak-proof test button Applied in electrical maintenance testing,office electricity safety testing,home improvement electrical safety testing ,test wall sockets Specifications: Brand: Bside Plug Standard: EU Plug Rated voltage Un= 220-250V (AC) 50-60HZ (EU Plug) Rated residual operating current: 5mA Earth resistance: Earth resistance meet the standard Size: 58*53*53mm/2.28*2.09*2.09in Weight: 61g Package Includes: 1 x Bside AST01ER Outlet Tester 1 x English User Manual Notes: Socket tester display "Correct" means the pole is connected correctly, but does not means resistance value is passed designation standard. Only passing "Creeping Switch Test", it can finally obtain the earth resistance value to test whether the Protection System works well or not. To ensure your safety, don't make the insert out of shape to affect the test result