Robuta

https://store.astm.org/a0773_a0773m-01.html A773/A773M Standard Test Method for dc Magnetic Properties of Materials Using Ring and Permeameter... https://www.astm.org/membership-participation/technical-committees/workitems/workitem-wk96998 WK96998 - Revision of A773/A773M-21 Standard Test Method for Direct Current Magnetic Properties of... ASTM International - Standards Worldwide