NV7011 Sumpner's Test of Two Single Phase Transformers is a very exclusive and important product designed for students of Electrical Engineering to explain the basic concepts of Sumpner's test. With this trainer, students can learn about the significance of conducting the heat run test with two single phase transformers and correspondingly can determine the efficiency and voltage regulation. Additionally one can also learn the phenomenon of polarity. The product helps to get fully acquainted with the basic concepts and functioning of the tests conducted on a single phase transformers. The product is represented in such an easy way so that each test can be studied in proper sequence. The varied scope of learning makes the subject complete understanding and interesting.