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Tennessee Weights & Measures Metrology Lab

Notice to Metrology Lab Customers

The newly constructed metrology laboratory is in the first stages of accepting artifacts for calibration. The laboratory staff members continue to work on our goals to expand the scope of our accreditation to better serve our customers. This website will be updated as our scope of services expands, with any additional information needed for the customer to properly submit their artifacts.

At this time, the laboratory is currently accepting:

  • NIST Class F mass standards: 0.001 lb to 10 lb decimal and fractional weights/weight kits
  • 5 gallon volumetric test measures
  • NIST Class F 20 lb, 25 lb, 50 lb, 500 lb, 1000 lb weights

Coming soon:

TBA: Echelon II (ASTM Class 2, 3, OIML Class F1, F2) 0.001 lb to 10 lb decimal and fractional weights/weight kits

TBA: Volume Transfer up to 500 gallons

TBA: Echelon I (ASTM Class 0, 1, OIML Class E1, E2) weights/weight kits

To schedule a calibration please contact the Tennessee Metrology Lab at (615) 837-5159. Calibrations will be scheduled first-come, first-served. Because staff is continuing to work on the scope expansion, turnaround times on submitted artifacts may be longer than usual, but rest assured we will strive to meet customer expectations.


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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.

Fee Schedule

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Related Links

For More Information

Tennessee Weights & Measures Metrology Laboratory
5203 Marchant Dr.
Nashville, TN 37211
Phone: 615-837-5159 Fax: 615-837-5015