Metrology/Moisture Meter Program

The Metrology Program tests, calibrates, and certifies standards for state agencies and private institutions. It is also the official keeper of Missouri’s primary standards of mass, volume and length. The Moisture Meter Program ensures the accuracy of all commercial grain moisture-measuring devices used in Missouri.

Grain Moisture Meters

The Missouri Weights, Measures and Consumer Protection division is responsible for ensuring the accuracy of grain moisture meters and associated equipment such as scales, thermometers, and charts. Weights and Measures officials annually inspect and certify moisture measuring equipment. The standards and inspection procedures for grain moisture meters are contained in NIST Handbook 44 Specifications, Tolerances, and Other Technical Requirements for Weighing and Measuring Devices. A copy of NIST Handbook 44 can be obtained from the U.S. Government Print Office, Washington DC 20402, phone: (202) 783-3238, or

Each January, owners and operators of moisture meters are required to register all commercial meters with the Weights, Measures and Consumer Protection Division. There is a registration fee of $50 for one device and $25 for each additional device. Registration forms can be obtained from the Missouri Division of Weights, Measures and Consumer Protection, Moisture Meter Program, P.O. Box 630, Jefferson City, MO 65102-0630.

Standards Calibration Laboratory

The Standards Calibration Laboratory (Metrology Laboratory) is housed within the Missouri Weights, Measures and Consumer Protection Division. Its responsibilities include performing mass and volume calibrations that are traceable to the international system of units (SI) through the National Institute of Standards and Technology (NIST). Calibration services are performed by appointment only and there is a $90 per hour fee for these services.

Metrology Lab/Moisture Meter Laws & Regulations

Revised Missouri Statutes: Chapter 413

National Institute & Standards Technology (NIST)