Function: 1. EASY DETECTION: Plug and play, one key detection. It can measure the current to measure whether the AC voltage of the socket is stable and normal use 2. CURRENT SWITCH: adjust the small 10A power socket and the large 16A power socket to switch 10A 16A, pull out the pin and turn 3. COMPACT AND PORTABLE: The socket tester is easy to carry, more convenient to store, small size with great function 4. FAST AND ACCURATE: AC10 socket, the tester is mainly used to test the polarity of the plug and the safety of the leakage switch. It can quickly and accurately detect the wiring of the plug, as well as test the socket voltage and display on the LED display 5. SCRATCH RESISTANT ABS: Using excellent ABS material, it has impact resistance, scratch resistance, environmentally friendly Specification: Item Type: Socket Tester Material: ABS Black colour Voltage measurement: 90-250V, 50-60Hz Leakage measurement: 10A 16A convertible Operating Current: RCD 220V ± 20V RCD current:> 30mA Operating voltage: 2.6V~3.3V Test voltage range: 0.1V-250V, 40-1KHz Working temperature: 0 ℃ ~ 40 ℃ Operating Humidity: 20%-75% RH Material temperature: -10℃~50℃ Stock humidity: 20%~80% RH Battery: 2 x AAA battery (not included) Package List: 1 x socket tester 1 x User Manual