Feature:1. This socket tester is made of high quality ABS material, which is sturdy and durable, and can be used for a long time.2. It can be used to detect the safety of the socket circuit in the place, and it is the best choice for the installation and maintenance of the home inspection.3. Can quickly detect whether the socket wiring is correct. Can measure the current and working voltage of RCD and GFCI, and you can use it with confidence.4. This product with compact size, light weight and convenient to use, to ensure the safety of household electricity and meet your various needs.5. The product has strong practicability and is widely used in many situations, such as living room, bedroom, office, etc.Specification:Item Type: Socket TesterModel: 20DMaterial: ABSApplication: Electric power numerical detectionModel20DOperating Voltage48-250V/45-65HzMeasuring Voltage Range48-250V/45-65HzOperating Temperature0-40Working Humidity20%-75%RHStorage Temperature-10-50Storage Humidity20%-80%RHAltitudeApprox. 2000m / 6561.7ftRCD Current>30mARCD Working Voltage220V20VGFCI Current>5mAGFCI Working Voltage110V20V.Package List:1 x Socket Tester1 x ManualNote:Cannot be installed in a damp place