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Metrology Lab

Notice to Metrology Lab Customers

The Tennessee state metrology lab is beginning the process of moving to newly constructed facilities. Due to that move, the lab will not accept any weights for calibration after August 15, 2017. The lab will continue to accept test measures of five gallons or less.

During this transition, customers may experience a longer than usual turnaround time for their calibrations. It is anticipated that the new metrology lab will again accept weights by January 2018.  

If you need a calibration during this transition, please contact your nearest state metrology lab for guidance.

These changes are part of a larger plan to improve and expand services. We appreciate the cooperation of our customers and we look forward to better serving your needs once the new facility is commissioned.


As part of the Consumer and Industry Services Division, the Tennessee Weights and Measures Metrology Laboratory (TWMML) maintains and houses the primary standards of mass, volume and length for the State of Tennessee. These standards were issued to the state in 1968 by the United States Congress through the Department of Commerce. Each state received a duplicate set of standards in mass, volume and length to help promote uniformity of weights and measures.

The standards used in the TWMML are directly traceable to the national standards maintained at the National Institute of Standards and Technology (NIST) in Gaithersburg, Maryland. These standards provide an unbroken chain of traceability to NIST for commerce and industry in the State of Tennessee.

Training for the Metrologists of TWMML is provided at NIST by the Office of Weights and Measures.  Classes offered by NIST include; a two-week basic course, a one-week intermediate course, and a two-part advanced course. NIST also offers training at Regional Measurement Assurance Programs held annually.  See the NIST Web page for more information on these courses.

TWMML is the sole source for legal metrology in the State of Tennessee. This laboratory provides a calibration service to all licensed servicepersons, and industry in the State of Tennessee.

Service Policies: Calibration services are offered on an appointment basis only. This policy limits the time the customer is without the standards and prevents lengthy turnaround.  For pricing information, please contact the laboratory or reference the fee schedule. The customer is responsible for all shipping charges and shipping arrangements to and from the laboratory. The laboratory will contact the customer when calibration is complete.

Laboratory Accreditation Information: In order to meet audit requirements, many laboratory customers regularly require information on the traceability of Tennessee's measurements. Tennessee is recognized through the United States Department of Commerce, National Institute of Standards and Technology. The TWMML periodically has its standards recalibrated at NIST and traceable through valid NIST Test Numbers on file at NIST and the TWMML in Nashville.

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For More Information

Tennessee Weights & Measures Metrology Laboratory
440 Hogan Road, Jennings Building
Nashville, TN 37220
Phone: 615-837-5159 Fax: 615-837-5015