The test range is wide, up to 10000. The test speed is fast, and the single-phase test is completed within 5 seconds. 240 * 128 color LCD screen, the interactive interface is more intuitive. It has the functions of blind measurement of transformation ratio, group test, tap position test, etc. No power down clock and date display, data storage function (850 groups of test data can be stored). High and low voltage reverse connection protection function. Transformer short circuit and inter turn short circuit protection function. Thermal printer output function, fast and silent. Small size, light weight and easy to carry. Friendly Man - Machine Interface. Specification : Range: 0.9-10000 Accuracy: 0.1%±2 numeric (0.9-500) 0.2%±2 numeric (500-2000) 0.3%±2 numeric (2000-4000) 0.5%±2 numeric (4000 Above) Resolving power: minimum 0.0001 Output voltage: 160V/10V (Autoshift) Power supply: AC220V±10%, 50HZ (Don’t use the generator) Service temperature: –10°C-40°C Relative humidity: ≤80%, No condensation Safety Measures: Before using this instrument, you must carefully read this operation manual. The instrument can be used indoors and outdoors, but it should avoid the environment of rain, corrosive gas and dust. The instrument shall avoid violent vibration. The maintenance, nursing and adjustment of the instrument shall be carried out by professionals. The yellow, green and red of the test clamp correspond to A/a, B/b and C/c of the transformer respectively. Do not connect them incorrectly. Do not connect the high and low voltage test lines reversely. When measuring single-phase transformer, only yellow and green lines are used, and the red test line is not connected (or suspended).