Features: Sockets tester are mainly used to detect polarits of power socker and safety of leakage switches. It can quickly and accurately detect the connection of the sockets at the same time:Includes 7 different modes for you to read:Correct / Grounds Open / NeutralOpen / Live/NEUReverse /Live/GRDReverse / LiveOpen / Live Ground Reverse Missing Ground. It can intelligently detect the presences of danger voltages. It can test the sockets voltage and display it on the LCDdisplay. The product has Three plug specifications (EU/US), which can meet the requirements of different countries and regions. Small size,easy to carry. Specifications: Material:ABS Type:EU,US Danger voltage warning: Yes. RCDGFCI Test:Yes. Work voltage:2.6~3.3V. Test voltage range:90V~250V/50~60Hz(EU),90V~130V/50~60Hz(US) Work temperature:0C~40C. work humidity:20%~75%RH. Stock temperature: -10C~50 C. Stock humidity:20%~80%RH. RCDcurrent:>30mA(EU),>6mA(US) RCDwork voltage:220V20V(EU),110V20V(US) Powered by:2Pcs AAA Battery(not included) Note: Please allow 1mm errors due to manual measurement. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package includes: 1x Socket Tester