Precision Force Calibration

Accredited Force Calibration to ASTM E 74 and E 4

Certificate # L2271 Calibration

National Standards Testing Laboratory - The Very Best In Precision Force Calibration Services

National Standards Testing Laboratory (NSTL) is a private, independent facility, founded in 1966. NSTL specializes in the precision calibration of force measuring instruments and systems including load cells (with accompanying indicator or mV/V), proving rings, and force gages. All calibrations are traceable to the National Institute of Standards and Technology.

National Standards Testing Laboratory has completed the accreditation process with the ANSI-ASQ National Accreditation Board (ANAB). ANAB Accredited Certificate Number L2271. National Standards Testing Laboratory is accredited to ISO/IEC 17025:2017 for force calibration in accordance with the ASTM E 74 Specification in Compression and Tension over the ranges from 10 lbf to 1,000,000 lbf and machine calibration in accordance with the ASTM E 4 Specification up to 6,000,000 lbf.

Link to our information on the ANAB website: National-Standards-Testing-Laboratory-Cert-and-Scope-File-11-10-2022_1668112223.pdf (

Capabilities and Uncertainty

National Standards Testing Laboratory has the capability of calibrating force measuring devices in both compression and tension with capacities from 30 lbf to 1,000,000 lbf. The uncertainty of the applied forces generated by the force standards of NSTL is within 0.002% of load up to 12,000 lbf and 0.01% of load from 12,000 lbf to 1,000,000 lbf. Devices of smaller or larger capacities may be able to be accommodated by special arrangement.

Contact Information

If you would like any additional information please let us know. We are available by telephone between the hours of 9:00 a.m. - 4:30 p.m. eastern time Monday - Friday. Or feel free to fax or e-mail anytime.

301-590-0097 or Toll Free 877-CAL-FORCE (225-3672)
Postal address
15753 Crabbs Branch Way
          P.O. Box 5808
Rockville, Maryland 20855
Electronic mail
General Information:

Fee Schedule Traceability Accreditation