With RCD testing function, this professional socket tester can quickly detect whether the outlet wiring is correct and check whether there is leakage triggering, which is more practical and safe. By checking the lines of the house and the polarity of the socket connection, this product can remind users of the need to adjust faults and safely threaten the sockets to ensure electrical safety in the house. Functions: - Attractive appearance: compact size, light weight and convenient to use. - Easy to use: Detect whether the neutral, live and ground wire is connected correctly and indicate which wire is missing za clear light patterns. - High-quality material: The impact-resistant ABS shell prevents the product from being damaged by a fall, making it more practical. - Bright LED light and amplifier; 3 Test indicators: With built-in LED lighting, this product can be used in the dark and easily read the test results. - 7 LED light patterns: with 7 indicators indicating the status of the socket, easy to evaluate: correct, open grounding, open neutral, HOT / neutral reverse, HOT / grounded reverse, open hot, Live neutral reverse. - Designed with RCD test button: Power socket for proper wiring and RCD trigger function. It can test the protection system to ensure electrical safety in your home. Ideal for protecting your safety from the risk of electric shock. - Wide application: electrical maintenance testing, office socket testing, power strip testing, school/laboratory/factory/etc wall outlet testing. Technical data: Material: ABS Color: Black Plug Type: EU/US (Optional) RCD test current: 30mA (EU) / 5mA （US） Operating voltage: 220 V-250 V (EU) / 90 V-120 V (USA), 50-60 Hz Operating temperature: -20 60 Product Size: approx. 10 * 5 * 5 cm / 3,94 * 1,97 * 1,97 inch Product weight: approx. 55 g / 1,94 oz Package Size: approx. 12 * 5,5 * 5,5 cm / 4,72 * 2,17 * 2,17 inch Package weight: approx. 80 g / 2,82 oz 1. The socket tester displaying “Right” only means that the pole is properly connected, but does not mean that the resistance value exceeds the standard of the marking. 2. Passing only the “Crawling Switch Test”, it can finally get the ground resistance value to see if the protection system is working well or not. 3. To ensure safety, do not make an insert out of shape to affect the test result. Public testing is prohibited without permission. 4. Turn off electrical appliances before checking power protection systems to make sure they are not damaged. Packing list: 1 * Socket Tester 1 * Users and #39; Manual (English)