Simple to Use - Plug this socket tester to any suspicious sockets and it tells you if there is a problem with sockets you have wired yourself. Safe to Test - RCD test gives you an assurance that the power leak-proof protection works well or not to avoid potentially dangerous situations. RCD (leakage protector) Function Detection: When the socket wiring is correct, press the "Test button". If the line grounding resistance meets the specification design requirements, the leakage protection switch should immediately trip and power off if there is no problem with the leakage protection switch. Otherwise, please contact a professional for repair. Specification: Color: Black Material: Flame Retardant ABS Plug standard:US Plug Voltage: 48V-250V 45-65Hz, R CD Test: ＞30mA, RCD Working Voltage: 220V±20V, GFCI Test: ＞5mA (US Plug), GFCI Working Voltage: 110V±20V, Voltage Measurement: 48V～250V / 45～65Hz, Accuracy: ±(2.0%+2), Working Environment: 0℃ ～ 40℃, 20% ～75%RH, Storage Environment: -10℃ ～ 50℃, 20% ～80%RH, Safety Rating: EN61010-1,-2-030, EN61326-1，CAT II 300V, Package included: 1 x socket tester Notes Displaying "Correct" means the polarity is connected correctly, but it does not mean the resistance value passes the designation of standard.
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