Need to check house wiring and verify socket connection polarity? Need a quick test for electrical outlets? Try our socket tester. It is a professional outlet tester that quickly detects whether the wire connection of the socket is correct. With RCD test function, it is more convenient and safe. Features: Electrical Outlet Tester – advanced socket tester to quickly detect whether the wire connection of outlet is correct. RCD/GFCI Test Button Design – allows easy testing of RCD/GFCI tripping function. It can test the protection system for household electrical safety and protection against the risk of electric shock. Easy to Use – detects if neutral, live wire, and earth are correctly connected and indicates which wire is missing with clear light patterns. LED Display – easy-to-read indicators show socket status: Good, Open Ground, Open Neutral, Live/Reverse Neutral, Live/Reverse Ground, Open Live & Live Neutral Reverse. Bright LED Light & 3 Test Indicators – light patterns are clearly marked on the surface of the socket tester. Wide Application – widely used for testing electrical maintenance, office sockets, power strips, wall sockets in schools, laboratories, factories, and other environments. Ideal for quick testing of socket issues. Portable Design – compact size, lightweight, and easy to use. Includes voltage backlight display for testing voltage. Specifications: Color: Black Material: ABS Plug Type: EU Voltage: 100V–240V, 50/60Hz RCD Tripping Current: 30mA RCD Voltage: 220V±20V GFCI Tripping Current: >5mA GFCI Voltage: 110V±20V Voltage Measurement: 90V–250V, 50/60Hz Working Environment: 0°C to 40°C, <80% relative humidity Safety Standards: EN61010-1, 12-030, EN61326-1 Item Size: approx. 80 x 63 x 46mm / 3.15 x 2.48 x 1.81in Item Weight: approx. 53g / 1.87oz Package Size: approx. 9 x 8 x 7.5cm / 3.55 x 3.15 x 2.95in Package Weight: approx. 83g / 2.94oz Package List: 1 x Plug Tester 1 x User Manual (English) Note: All data measured manually. Please allow 1–3cm measurement variation. Due to lighting and display differences, there may be slight color variations. Actual product may vary slightly.