Please note that depending on the voltage, the open circuit test is divided into two standards RCD Test 30mA (EU/UK Plug), 220V20VGFCI Test 5mA (US Plug), 110V20VThe principles and functions of the two tests are exactly the same. Please choose according to your local voltage and socket specifications. If you have any questions, please contact us, thank you.Advanced HABOTEST Socket Tester can help you check house wiring and connection polarity of socket, it can also use to test leakage tripping. It is a professional socket tester which rapidly detect whether the socket's wire connection is correct or not. With RCD/GFCI test function, it is more practical and safe.Features PORTABLE ELECTRIC SOCKET TESTER Advanced socket tester for rapidly detecting whether the socket's wire connection is correct or not. Compact size, light weight and convenient to use. With voltage backlight LCD display for testing voltage.PLUG & PLAY 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 LED DISPLAY Light patterns are well labeled on the back of the device itself. The Red LED indicators can be light up clearly even in strong sunlight also be used in the dark, making you read it fast.6 LED LIGHT PATTERNS With 6 easy to read indicators to indicate the state of the socket, easy to judge Correct, Open Ground, Open Neutral, Live/Neutral Reverse, Live/Ground Reverse, Live/Ground Reverse, Missing Ground.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 inspectionIt saves you lots of time in testing problems with sockets.NOTE Please Be Mind, The Displayed Voltage Value Only For Reference Specification Brand Name HABOTESTColor BlackModel HT107B(US)/HT107D(EU)/HT107E(UK) (Optional)Material Flame Retardant ABSOperating Voltage 90~250V/45~65HzPhase Voltage 90~250V/45~65HzLeakage Voltage 0~99V/45~65HzAccuracy ( 0%+2)RCD Test 30mA (EU/UK Plug)RCD Working Voltage 220V20VGFCI Test 5mA (US Plug)GFCI Working Voltage 110V20VWorking Environment 0 40, 20% 75%RHStorage Environment 10 50, 20% 80%RHItem Size 68 * 65 * 60mm / 7 * 6 * 4inItem Weight 74g/ 6ozPacking List 1 * Electric Socket Tester