Feature: 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 220V 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. Specification: Item Type: Socket Tester Model: HT107B Material: ABS Plug: UK Plug 90~250V Uses: Industry, home Working Voltage: 90~250V/45~65Hz Phase Voltage: 90~250V/45~65Hz, Accuracy: ± (2.0%+2) Leakage Voltage Measurement Range: 0~99V/45~65Hz, Accuracy: ± (2.0%+2) 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 RCD Working Voltage: 220V±20V GFCI Test: >5mA GFCI Working Voltage: 110V±20V. Package List: 1 x Socket Tester1 x Manual Note: 1. The detection time cannot exceed 5 minutes.2. Please be careful not to touch the RCD button during use, so as to avoid accidentally triggering the leakage protection switch and causing unnecessary losses.