1、[GFCI Function] This electric tester tests GFCI equipment by simulating ground fault conditions. It is suitable for GFI sockets and confirms the operation of ground fault protection equipment. 2、[Voltage Display] The LED display can help you measure the socket voltage and display it clearly on the LCD screen. 3、[High Quality Shell] The ergonomically designed and high‑impact ABS shell maintains an impact and compression rating higher than the industry standard. 4、[Wiring Fault Detection] It can detect the most common wiring faults in standard and GFCI power outlets, and also use standard 3 wire and GFCI protected AC outlets. It can detect open wiring faults through open ground, open heat, open neutral, reverse polarity, and thermal/neutral reverse wires. 5、[Range Of Application] Compact structure, small and portable, suitable for detecting and receiving socket safety hazards in homes, offices, factories and other places. Item Type: Socket Tester Model: HT107B Material: ABS Uses: Industry, home Working Temperature: 0°C~40°C Working Humidity: 20%~75%RH Storage Temperature: -10°C~50°C Storage Humidity: 20%~80%RH Altitude: ≤2000 Meters RCD Current: >30mA GFCI Test: >5mA 1 x Socket Tester 1 x Manual