Proficiency Testing for Accredited Calibration Laboratories and Dimensional Inspection Laboratories

Welcome to HN Proficiency Testing, Inc.

You can get an overview of the tests we offer on our availability page.

Through this site you can access your test history, book tests and enter test results.

To use these features, you have to create a login ID. When you create your login ID you have to enter your e-mail address. If you have used our services in the past, or have tests booked, and your e-mail address matches the one we have on file for you, you will automatically be linked to your test history and will not have to re-enter anything.

If you have not used our services before, you will be prompted to enter your contact information. Afterwards you will not have to re-enter it when you return to the site, or book new tests.

Please note that we are not able to ship test packages out of the United States, so you must provide us with a US shipping address.

If you have ANY problems with the web site, please let us know, we can only correct it, if you let us know.

We are A2LA accredited. You can download our scope from the A2LA website. Or get our local copy.

From time to time we may add a new test before it is added to our scope of accreditation. The availability page details the accredited status of each test.

We are of course recognized by A2LA, as well as LAB, ACLASS/ANAB, Perry Johnson Laboratory Accrditation and NVLAP as a way to satisfy their proficiency testing requirements. In fact, we are not aware of any calibration laboratory accrediting body in the US with proficiency testing requirements that does not recognize our tests.

For the kinds of tests we offer, where evaluation is done using the En metric, you have to report uncertainties along with your results. Our tests are open to participants who report the expanded measuring uncertainty of their results using a coverage factor of k=2, or having a coverage probability of approximately 95%, and report it as a scalar value in the unit of the measurand.

If you are new to uncertainty estimation, HN Metrology Consulting offers an online uncertainty course that can help you get started.

Accreditation bodies generally require laboratories to develop a plan for how they intend to live up to the proficiency testing requirements. We will be happy to help you develop a plan that you can present to your assessor and accreditation body. We offer an incentive of a 10% discount on the 2nd test, 15% on the 3rd test and 20% on subsequent tests, if you participate in a test at least every 6 months.

You can e-mail us your scope and we will help you develop a plan.

We require all participants to keep our reference values confidential and to keep the identities of other participants we may disclose to allow us to ship packages directly from participant to participant confidential. We will, of course, also keep your participation confidential, unless you tell us otherwise.

We accept the following credit cards for payments for proficiency tests:

Visa MasterCard American Express

How do you choose a proficiency testing provider? We have compiled a list of questions for you to use, when you try to decide. All our tests are covered by our A2LA scope of accreditation.

The paper "Experience Gained from Offering Accredited 3rd Party Proficiency Testing" was presented at the 2004 NCSLI Workshop & Symposium. The paper "Determining Consensus Values in Interlaboratory Comparisons and Proficiency Testing" by Henrik S. Nielsen won the "Best Paper on Theoretical Metrology" award at the 2003 NCSLI Workshop & Symposium and I presented the paper "Can Proficiency Testing Add Value" at the NCSL-I conference in San Diego in August 2002. There are no prizes for guessing what my conclusion is. 


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Dr. Henrik S. Nielsen