U.S. flag

An official website of the United States government

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

Physical Measurement Laboratory

Office of Weights and Measures

OWM Examination Procedure Outlines (EPOs)

Share

EPO 30 cover (2025 edition)

A portion of the Examination Procedure Outlines (EPOs) in this collection are current to the 2025 edition of NIST Handbook 44. These are highlighted with bold date text in the table below. The remainder of the EPOs are current to the 2015 edition of NIST Handbook 44.

Some of the EPOs that appeared in the original version of NIST Handbook 112 (2002) have yet to be updated and are not included in this collection.

EPO (or its Appendix)TitleDate Published
EPO 1Retail Computing Scales 2025-04
EPO 5 - Appendix A Table 1Prescription and Jeweler Scales - Part 1 Electronic2014-09
EPO 5 - Appendix A Table 2Prescription and Jeweler Scales - Table 1 Units of Mass Conversion Tables (1) – Carat (Metric) to Grams (Excel File)2014-09
EPO 5 - Appendix A Table 3Prescription and Jeweler Scales - Table 2 Unit of Mass Conversion Tables – Pennyweight (Troy) to Grams (Excel File)2014-09
EPO 5 - Appendix A Table 4Prescription and Jeweler Scales - Table 3 Units of Mass Conversion Tables (3) – Pounds (avoirdupois) to Grams (Excel File)2014-09
EPO 5 - Appendix A Table 5Prescription and Jeweler Scales - Table 4 Units of Mass Conversion Tables (4) – Ounces (avoirdupois) to Grams (Excel File)2014-09
EPO 5 - Appendix A Table 6Prescription and Jeweler Scales - Table 5 Units of Mass Conversion Tables (5) – Ounces (troy) to Grams (Excel File)2014-09
EPO 7Medium Capacity Scales2014-09
EPO 9Part 1 – Monorail Scales - Electronic Digital Indicators and Part 2 – Monorail Scales and Meat Beams – Mechanical2014-09
EPO 12Livestock and Animal Scales Part 1 - Electronic Digital Indicating Part 2 – Mechanical – Analog Indicating2014-09
EPO 13Vehicle and Axle-Load Scales Part 1 - Electronic Digital Indicating Part 2 – Mechanical-Analog Indicating2014-09
EPO 14Belt-Conveyor Systems2014-09
EPO 16Automatic Bulk Weighing Systems2014-09
EPO 16 - Appendix AAutomatic Bulk Weighing Systems - Description of Test Methods2014-09
EPO 16 - Appendix B/ Supp. 1Automatic Bulk Weighing Systems - High-Level Steps to Performing the Increasing Load Test Using the Substitution or Alternative Substitution Test Method2014-09
EPO 16 - Appendix B/ Supp. 2Automatic Bulk Weighing Systems - Determining Scale Error When Applying the Substitution Test Method2014-09
EPO 16 - Appendix B/ Supp. 3Automatic Bulk Weighing Systems - Determining Scale Error When Applying the Alternative Substitution Test Method2014-09
EPO 16 - Appendix CAutomatic Bulk Weighing Systems - Definitions2014-09
EPO 21Retail Motor Fuel Dispensers - Single, Dual, and Multi-Product (except blenders)2025-08
EPO 22Retail Motor Fuel Dispensers – Blended Products2025-08
EPO 23Vehicle-Tank Meters (VTMs) - Power-Operated2025-06
EPO 24Vehicle-Tank Meters (VTMs) - Gravity Discharge2014-09
EPO 25Loading-Rack Meters2025-06
EPO 26Liquefied Petroleum Gas (LPG) - Liquid-Measuring Systems2014-09
EPO 28Compressed Natural Gas (CNG) - Retail Motor-Fuel Dispensers2014-09
EPO 29Hydrogen Gas Retail Vehicle Fuel Dispensers2024-11
EPO 30Retail Electric Vehicle Fueling Systems2025-07
EPO Annex 1Safety Considerations and Glossary of Key Safety Phrases2025-03

 

Metrology, Standards, Documentary standards, Standards education, Transportation and Automotive
Created May 7, 2015, Updated December 3, 2025
Was this page helpful?