FUYI FY1881 High Precision Power Polarity Phase Socket Tester 1. Voltage measurement (EUUK Plug): 30V~250V 2. Voltage measurement (US Plug): 30V~120V 3. RCD test (EUUK Plug): 30mA 4. RCD working voltage: 220V 5. RCD (GFCI US Plug) Test: 5mA 6. RCD (GFCI) working voltage: 110V 7. Judgment of wiring status: seven types 8. Display: full backlit LCD screen 9. Status Indicator: Red and Green 10. Date storage: 20 groups 11. Low battery indicator: yes 12. Working temperature: 0~40 degrees Celsius 13. Battery: 2 x CR2032 (not included) 14. Quickly and intelligently measure whether the socket connection line is correct 15. Through the full backlit screen, it can clearly display various wiring status even in the dark environment, with small size and light weight, the use process is very easy and pleasant 16. AC voltage can be accurately measured and displayed on the screen in real time 17. AC voltage measurement range is 30V-250V 18. Designed with RCDGFCI test button, one key to know the working status of the leakage protector, very suitable for protecting your safety from the risk of electric shock 19. Data storage function, convenient to record voltage at different times or in different environments, can store 20 groups 20. Widely used in electrical maintenance testing, office socket testing, power strip testing and wall socket testing in schools, laboratories, factories and other social fields 21. Weight: 86 grams