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Checking the Net Contents of Packaged Goods (as adopted by the 104th National Conference on Weights and Measures 2019)



Breyanna M. Blackwell


This handbook has been prepared as a procedural guide for the compliance testing of net content statements on packaged goods. Compliance testing of packaged goods is the determination of the conformance of the- results of the packaging, distribution, and retailing process (the packages) to specific legal requirements for net content declarations. This handbook has been developed primarily for the use of government officials. However, it should also be useful to commercial and industrial establishments in the areas of packaging, distribution, and sale of commodities. In conducting compliance testing, the conversion of quantity values from one measurement system to another (e.g., from the metric system to the avoirdupois system) should be handled with careful regard to the implied correspondence between the accuracy of the data and the number of digits displayed. In all conversions, the number of significant digits retained should ensure that accuracy is neither sacrificed nor exaggerated. For this 2020 edition of Handbook 133 all dimensions for test procedures, devices, or environments have been rounded to two significant digits (e.g., 2.5 cm to 1.0 in) or to a precision level applicable to the test equipment (e.g., 200 kPa for 25 psi and 35 MPa for 5,000 psi).
Handbook (NIST HB) - Handbook 133
Report Number
Handbook 133


weight, measures, packaged, dimensions, testing, test procedures, conversions, net contents


Blackwell, B. (2019), Checking the Net Contents of Packaged Goods (as adopted by the 104th National Conference on Weights and Measures 2019), Handbook (NIST HB), National Institute of Standards and Technology, Gaithersburg, MD, [online], (Accessed June 14, 2024)


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Created November 25, 2019, Updated January 25, 2020