1. The tester is supplied with AC220V low voltage power to provide current for AB, BC and CA high voltage windings of the transformer automatically; collects data simultaneously and; calculates impedance error percentage automatically with intuitive testing results;

2. The tester completes the three-phase testing automatically in the primary connection mode other then inversed connection with the testing wire;

3. The tester allows either single phase testing or three-phase testing both manually and automatically;

4. The tester achieves output current limit applicable to test item with any impedance;

5. The test item can be measured without an external voltage regulator;

6. The tester functions in measuring zero sequence impedance;

7. The tester functions in measuring inductance;

8. The tester has a large LCD display with a menu in Chinese. Operation are facilitated based on the notes on the display;

9. The tester enables printing and storage and is featured with high testing accuracy, high automation, small in size and light weight.