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Using State Metrology Labs
Many people are unaware that taxpayer-funded State operated metrology laboratories (e.g., State Dept. of Agriculture) offer inexpensive calibration of weights (aka mass).
Texas Department of Agriculture – Metrology Program Standard Calibration Services and Fee Schedule
Louisiana Department of Agriculture and Forestry – Metrology
For a complete list (with general contact information), visit: https://www.nist.gov/pml/owm/weights-and-measures-resources/state-metrology-laboratories