====== Using State Metrology Labs ======
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Having weights (mass) re-calibrated by a commercial metrology (calibration) laboratory is often cost prohibitive (i.e., it's cheaper to purchase new certified weights). However, many taxpayer-funded State operated metrology laboratories (e.g., State Dept. of Agriculture) offer inexpensive calibration of weights (aka mass). Check the fees from your State Metrology lab before purchasing new weights.

[[https://www.texasagriculture.gov/Portals/0/Files/ACP/Weights/Metrology/Metrology_Standard_Fee_Schedule.pdf?ver=Woh-1L_ZwYIeovYog_Xh8Q%3d%3d|Texas Department of Agriculture – Metrology Program Standard Calibration Services and Fee Schedule]]

[[https://www.ldaf.state.la.us/consumers/consumer-protection-weights-and-measures/metrology-lab/|Louisiana Department of Agriculture and Forestry – Metrology]]

[[https://agriculture.ks.gov/divisions-programs/ag-lab/metrology-lab2|Kansas Department of Agriculture – Metrology Lab]]

[[https://www.agriculture.arkansas.gov/plant-industries/bureau-of-standards/state-mass-volume-lab/|Arkansas Department of Agriculture – State Mass/Volume Lab]]
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For a complete list (with general contact information), visit: [[https://www.nist.gov/pml/owm/weights-and-measures-resources/state-metrology-laboratories]]
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[[https://www.nist.gov/system/files/documents/2020/03/24/gmp-11-calibration-intervals-20190506.pdf|NIST GMP 11 – Good Measurement Practice for Assignment and Adjustment of Calibration Intervals for Laboratory Standards]], "//Table 3. Recommended calibration intervals for mass standards for Echelon III calibrations//" provides for good __initial__ calibration intervals. Where check weights (mass) are only used to calibrate (or verify) the accuracy of weighing scales 2 or 3 times a year, these are typically placed on an extended calibration interval due to their seldom use and minimal wear (provided that they're not mishandled or damaged).

Read "Reducing Waste: Through Optimizing Calibration Intervals" for detailed information on how to justify extending calibration intervals.