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Home The National Association for Proficiency Testing NAPT is the most trusted name in the metrology community for providing proficiency kits. As the only nonprofit metrology provider NAPT guarantees a complete independent evaluation of your enrollment ensuring that integrity is upheld every single time without question. There will never be a conflict of interest. When you are seeking a truly independent metrology proficiency testing provider for the administration and development of proficiency kits software tools and support for interlaboratory comparisons look no further than NAPT.