Quality Control Services

2340 SE 11th Ave Portland, OR 97214
Metrology weight calibration

Weight Calibration Services

Quality Control Services' State-of-the-art Metrology Laboratory is accredited by the American Association for Laboratory Accreditation (A2LA) under Certificate 1550.01. Our Metrologist has been trained at and certified by NIST (National Institute of Standards and Technology in Gaithersburg, MD) for Basic, Intermediate, and Advanced Mass Metrology. Along with ten other metrology laboratories (including eight western states), we participate in the Western Regional Measurement Assurance Program (WRAP) sponsored by the NIST Office of Weights and Measures. This involves continuing education as well as round-robin proficiency testing sponsored by NIST.

Your weights will be compared to standards traceable to the SI (International System of Units) through NIST. The laboratory environment is controlled by a dedicated HVAC System that provides temperature and humidity control that exceeds NIST and NCSL requirements for Echelon 1 laboratories. Mettler and Sartorius Mass Comparator Balances are interfaced directly with calibration software, including NIST’s Mass Code Program, for the most accurate and error free results available. Our environment and equipment allow us to work at the highest levels of calibration as specified in ASTM, OIML, and NIST procedures.

NIST Traceable / Accedited Weight Calibration Certificates

QCS’s Metrology Laboratory is accredited to calibrate all weights from 1 mg to 30 kg, including other measurement units ( lb/oz, grain, etc. ) within that range. See our scope for specific measurement capabilities available at each range. Uncertainties are calculated using methods consistent with the Guide to the Expression of Uncertainty in Measurement (GUM) with a k factor of 2 for an approximate 95% level of confidence.

Weight Calibration Certificates issued by QCS are NIST Traceable and accredited by A2LA. Conventional (Apparent) Mass is always reported along with Measurement Uncertainty, and True Mass (Mass in Vacuum) can be reported as well upon request.

New or Replacement Weights

New weights and weight sets are available. Many common weights and weight cases are kept in stock and available immediately, and any others can be ordered. Custom weights and cases are even available.

If necessary, we can replace weights with ones that match those in your set, although in most cases, weights found out of tolerance can be cleaned and/or adjusted in our laboratory. We will advise you at the time of calibration as to the best course of action for dealing with problem weights.

For questions or to schedule calibration services, please contact our Metrology Manager, Dave Thompson at 800-843-1237 or email to lab@qc-services.com.

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A2LAweight calibration accredited Metrology Form:

Did you know:

The kilogram was redefined in 2019 for the first time in 143 years? It hasn’t had a noticeable effect for most people, but it’s still kind of a big deal. Follow the link below for the story.

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