Abstract: B Type rings were found different with Ketos ring and AS5282 ring on the standards and application requirements in using. The three rings were surveyed for their standards and application status, and were tested and investigated for their hardness, the number of the indicated holes corresponding with magnetic current, and leakage field measurement for each hole of rings. The results showed that there was an uncertainty when B Type rings were used as a standard of rings. It is advised that B Type rings standard GB/T 23906—2009 and MH/T 3008—2004 should be revised.