1. Test and display the upper & lower limiting load and any error (ratio, phase-angle difference) of national standard test PT.
2. Test and display any two groups' actual load standard percentage point and any percentage point error (ratio, phase-angle difference).
3. Test ratio and polarity of the PT.
4. 640×480LCD; easy to connect wire and operate, convenient to carry.
5. Can store and print all test results, convenient to review.