This instrument use high accuracy (1uA) leakage test and updated CT shielding technology. It is composed of special HV detector and HV insulation rod. It can wireless transmit testing data within distance of 30m. 1. The full realization of the zinc oxide arrester online uninterruptible power test. 2. The latest CT and shielding technology. 3. No lightning counter can test the zinc oxide arrester leakage current. 4. Completely solve the 6-10kV zinc oxide arrester test problems. 5 without climbing pole without wiring fast and accurate test. 6 can accurately detect the leakage current of 10uA. 7. Zinc oxide surge arresters or aging judgment online. 8. High-speed sampling frequency advanced digital signal processing technology anti-jamming performance high accuracy measurement results. 9. Optional configuration with battery especially suitable for power occasions. 10. Small size light weight easy to carry.