Reference
Standards Index
A curated catalog of the standards that govern measurement — what each one covers, its status, and where the official text lives. Protected content is never reproduced here.
NIST Handbook 143:2019
State Weights and Measures Laboratories Program Handbook
NIST
Current
NIST Handbook 44 (2025)
Specifications, Tolerances, and Other Technical Requirements for Weighing and Measuring Devices
NIST
Current
NIST IR 6969:2019
Selected Laboratory and Measurement Practices and Procedures to Support Basic Mass Calibrations (SOP series)
NIST
Current
NIST SP 330:2019
The International System of Units (SI)
NIST
Current
NIST SP 811:2008
Guide for the Use of the International System of Units (SI)
NIST
Current