Product Features: For use with single-phase TTR models, including 550005B Extends ratio range of single-phase models to 329.99:1 Turns ratio: 100:1 and 200:1 Accuracy: +/- 0.1% Includes cables necessary for connection to TTR sets Dimensions (H x W x D): 8 x 13 x 10 in. (203 x 330 x 254 mm) Weight: 13 lbs. (5.9 kg) Details: The Megger 550030 Auxiliary Transformer extends the ratio range of single-phase models to 329.99:1. The turns ratio of the transformer is 100:1 and 200:1, while it is accurate to within +/- 0.1%. The 550030 Auxiliary Transformer includes all the necessary cables for connection to the TTR set and the transformer under test.