Save Money

Save money on each ILC/PT enrollment, INTRA, or custom I-ILC design. The more you purchase, the more you save.


Get Expert Guidance

Priority access to guidance from NAPT staff and technical advisors.

Priority order when waiting for a kit (over non-members only).

Create a comprehensive 4-year ILC/PT plan.

Build Credibility

By testing with NAPT, you are able to demonstrate measurement assurance to your clients. 

Benefit from increased visibility with a listing in our member directory.

Members Receive 20 % off all Purchases

Membership Discounts

What Members Say

“NAPT is a great proficiency testing service, and has helped us refine our proficiency testing process. They took the extra time to communicate over and above with us which demonstrates their commitment to their customers. We have been using NAPT for 15 years and the service has always been top notch. They offer a diverse service and the detailed reporting is outstanding.”
"The NAPT staff has consistently demonstrated their commitment to providing a timely proficiency test with prompt responsiveness and technical support. The statistical analysis report is very thorough and elaborate. Technical support is top notch, demonstrating a high level of competence in proficiency testing, analysis, calibration methods and associated measurement uncertainties. Top notch PT provider!"
"Transcat partnered with NAPT in 2000 because of NAPT’s commitment to support calibration laboratories seeking to become accredited to ISO/IEC 17025 (Guide 25 at that time). But NAPT has also proven, over the past 20 years, to have excellent customer service and the ability to flex with Transcat’s needs for additional proficiency tests as we have grown and added new capabilities to our network of commercial and private calibration labs. We recently reached a point of growth where we found it necessary to divest the portion of proficiency tests we had administered internally; NAPT stepped up to take on these internal PTs by offering us a complete program solely managed by NAPT – and at a reasonable price! We continue to partner with NAPT because they are simply the best proficiency testing provider in the business!"

Artifact Sponsorship Program

Help NAPT Increase Our Kit Offerings

NAPT constantly strives to expand the scope of ILC/PTs that we offer. In order to do this we depend on the generous support of Artifact Sponsors who donate, lend, or fund test artifacts 

Trusted Worldwide

Since 1996

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