Skip to main content
U.S. flag

An official website of the United States government

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

Taking Measure

Just a Standard Blog

Weighing My Career as a Metrologist

Blonde woman in white lab coat working on equipment

Retired NIST Weights and Measures Division Chief Carol Hockert inspecting a Frazier Russell equal arm balance.

Credit: F. Webber

As happens with most every metrologist I know, I fell into metrology (the science of measurement) quite by accident. My degree was in chemical engineering, and I was probing the world around me to see what kind of work was out there for someone with my skills and interests. I learned of an upcoming vacancy in a metrology laboratory at the state of Minnesota’s Weights and Measures Division and scheduled a visit—even though I didn’t know what a metrology lab was.

When I got there, I found out that metrology was critically important in both commerce and industry. In order to ensure the accuracy of measurements made at grocery scales and gas pumps, regulatory officials need to use calibrated equipment to test these devices. The metrologists in the lab would calibrate weights as small as 1 milligram and as large as 110,000-lb. railway test cars. These weights were used to verify the accuracy of scales used for all manner of applications, from jewelers’ scales to drug manufacturers to railway shipments. They also calibrated volumetric measures and glassware that were then used to check gas pumps, containers of milk, and other liquid products and their dispensers.

And of course, all the measurements and standards they provided were even more critical to industry and manufacturers—after all, you can’t make a product if you can’t measure its components!

As I learned more, I was struck by how metrologists in the weights and measures field have such an impact on everyday life. So, needless to say, I took the job at the Minnesota Weights and Measures Division and never looked back. It was great. Work was fun, the days flew by, and I was always learning something new.

For example, one of the first things I did was go to the National Institute of Standards and Technology (NIST) for metrology training.

At NIST, I learned “the right way” to do things from my now-colleague Georgia Harris and made many friends among the other metrologists at the training. I also attended my first National Conference of Standards Laboratories (now NCSL International) workshop and symposium in 1995, which broadened my horizons further.

My first year at the Minnesota lab was spent preparing to apply for accreditation through the National Voluntary Laboratory Accreditation Program (NVLAP), which meant we had to write procedures, develop control charts, and implement a quality system, all from the ground up.  At first, I wasn’t sure what the significance of accreditation was, but found out later that it meant a lab was in compliance with the international standards governing calibration labs based on an independent, third party assessment. As such, calibrations performed by an accredited laboratory are accepted worldwide.

Our lab was one of the first state laboratories accredited by NVLAP and soon, we were calibrating weights for customers all over the country and the world. We boasted most accurate mass measurements in the country outside of NIST and had the credentials to support it.

Carol Hockert stands at a table.
Hockert assisting a weights and measures inspector trainee.
Credit: F. Webber/NIST

One project I found fascinating/exciting/challenging was the calibration of the deadweights for Boeing’s automated, 100,000-pound deadweight tester, which is used to calibrate another device that measures the thrust produced by things like jet engines. While they sent their largest weights to NIST for calibration, we at the Minnesota lab were tasked with calibrating the majority of the pieces.

In fact, some of my favorite memories of working at the state lab were the physical part of the job. Calibrating 5,000-pound weight carts, climbing on 1,500-gallon provers to adjust and seal them, pressurizing a liquefied petroleum gas prover, and pounding lead seals into cast iron weights were great ways to relieve stress and stay in shape. I liked that there was no “routine” to the days. We were the janitors, the secretaries, the quality managers, the shop technicians, and the technical experts!

Becoming a metrologist also gave me opportunities to develop leadership skills through NCSL International, first as a section and region coordinator, then as a board member, and eventually as president. I also honed my communications skills through my work with the regional Measurement Assurance Program, where I coordinated proficiency tests and gave presentations.

Looking back now, what I miss most about working in a metrology lab is solving technical problems, satisfying customers, and the sense of accomplishment that came with the job.

I left the lab when I was given the opportunity to manage the entire weights and measures program for the state of Minnesota, which broadened my horizons once again. Instead of worrying about measurement accuracy, I was tasked with enforcing the weights and measures laws and regulations for the state. I made a habit of telling the regulatory officials who tested and inspected scales and gas pumps that they were “field metrologists.” After all, they were making measurements in order to verify the accuracy of these devices, assuring buyers and sellers a fair exchange in the marketplace.

Since I came to NIST in 2006, we’ve trained many regulatory officials and metrologists from across the country and around the world. I’ve seen them experience that same satisfaction from getting a measurement right that will ultimately ensure consumers get what they’re paying for and businesses will be able to compete on a level playing field.

I’ve heard it said that weights and measures (and by extension, metrology) is the most important field of work that nobody’s ever heard of. But the satisfaction of knowing the results of this work touch virtually everyone in the country easily makes up for the lack of fame.

About the author

Carol Hockert

Carol Hockert is the former chief of the Office of Weights and Measures at NIST, which provides technical expertise, training, international perspective and representation, and oversight to the U.S. legal metrology infrastructure. She also serves as the executive secretary for the National Conference on Weights and Measures. When she’s not busy juggling her professional responsibilities, Carol devotes time to managing the family foundation.

Related posts


Wonderful article by an amazing woman. This is really a magical "unknown" field of science & engineering. The work being done in metrology is on the cutting edge of research for many disciplines. I know Carol will be missed as she steps down from her role as Weights & Measures Division Chief after 10 years, but the increasingly important work of her division and staff will remain as her legacy at NIST.
Very good article Carol. I look back on my years with the FDACS Metrology Lab with fond memories. I remember how getting our NVLAP accreditation was such a significant achievement!! Thanks for writing about a position I held in high esteem and still use in my work with FDOT.
Dear Ms. Hockhert, I have been doing a weighing experiment for the last couple of years to see if the idea on a paper I published 2013 entitled "The Two Energies of Matter" has any experimental validity. I am comparing the weight of my 10lb. iron weight at two different times of the year. At alphelion and perihelion. If the mass of the earth changes as it orbits the sun it should affect the weight of my 10lb. iron weight. Last year the 10lb weight gained 5 grams from January to July and then lost the 5 grams of weight by January. I am now waiting to see if it gains back its 5 grams again by next July. My weight experiment is designed to show if there is a slight change in the inertial mass of the earth due to the eccentricity of its orbit at these two different times of the year which should in turn effect the weight of the 10lb. iron weight. I was wondering if NIST had conducted any similar experiments like this one. Best Regards, Don Hamilton
Hi Donald, Iron weights are not used when making precision mass measurements because they are not as stable as stainless steel. Further, unless the mass of the weight is being determined in a controlled environment, such as a metrology laboratory, the humidity and temperature changes during the year will affect the mass of any weight. Finally, the accuracy of your results are dependent on the precision of the balance, the procedure you are using, and your training and experience in mass measurement. In my experience, cast iron weights that are well-maintained do not gain or lose significant weight (I consider 5 grams to be significant) during the course of a year.
Great post - educational and inspiring!!
A great story. Thanks for taking the time to share your experiences.

Add new comment

Enter the characters shown in the image.
This question is for testing whether or not you are a human visitor and to prevent automated spam submissions.
Please be respectful when posting comments. We will post all comments without editing as long as they are appropriate for a public, family friendly website, are on topic and do not contain profanity, personal attacks, misleading or false information/accusations or promote specific commercial products, services or organizations. Comments that violate our comment policy or include links to non-government organizations/web pages will not be posted.