API RP 13B-2
API RP 13B-2 Recommended Practice for Field Testing of Oil-based Drilling Fluids, Fifth Edition, Includes Errata 1 (2014), Errata 2 (2018), and Addendum 1 (2019)
standard by American Petroleum Institute, 04/01/2014
standard by American Petroleum Institute, 04/01/2014