DC resistance tester is a new generation of transformer DC resistance tester, which can automatically select the test current according to different types of power transformers and display the test results at the fastest speed. The DC resistance tester has the functions of storage, clock, printing and discharge indication. Built-in power-on memory can store measurement data for a long time. The adoption of large-screen LCD makes the tester have a good man-machine interface and simple and convenient operation, so it is the first choice for DC resistance testing. Wuhan Sanxin Power Equipment Manufacturing Co., Ltd. can be used as a reference.