Proficiency Testing
PT samples have to be right. Your laboratory’s accreditation is at stake, so anything less than 100% confidence is just not good enough. That’s why we bring over 25 years of multidisciplinary reference material manufacturing and certification experience into every step of our process. And that’s why our analytical validation specifications are more stringent than the current TNI standards.
Receive your quote directly from the manufacturer.
Fast, easy, excellent customer service
For State Required PT
Products and materials were easy to order online and customer service was excellent during followup phone call and email.
Review Date: 10 Sept 2025 | ZeptoMetrix - Analytical Reference Materials
Dependable
Proficiency Testing for Accreditation
Ordering, using, entering, and reporting are all very easy.
Review Date: 2 Sept 2025 | ZeptoMetrix - Analytical Reference Materials
We are very satisfied after working with NSI by ZeptoMetrix for our DMRQA45 process.
Wastewater Laboratory DMRQA45 Testing
The DMRQA45 assessment process was smooth largely thanks to our representative Dana Fields, who we have worked with for several years through NSI. Ms. Fields is prompt to reply to any questions or concerns we have with informed and useful information and/or direction. In addition, the instruction sheets for each test are easy to follow.
Review Date: 26 Aug 2025 | ZeptoMetrix - Analytical Reference Materials
Great product and easy to report
Proficiency testing for laboratory certification.
NSI proficiency testing materials and data entry has been the easiest I've encountered while in the industry.
Review Date: 26 Aug 2025 | ZeptoMetrix - Analytical Reference Materials
Not as good as last used
Water treatment
Product has changed since last time used and has gotten less quality
Review Date: 26 Aug 2025 | ZeptoMetrix - Analytical Reference Materials
NSI PT is great!
Food Microbiology
The proficiency testing provided by NSI is a great tool to gauge the laboratory performance and accuracy. The samples provided by NSI are easy to use for technicians of all experience levels. We will continue to use NSI for all PT needs!
Review Date: 25 Aug 2025 | ZeptoMetrix - Analytical Reference Materials
The PT samples from NSI Laboratory were well-prepared, properly packaged, and clearly documented. We appreciate the prof
Use of Proficiency Test Samples for Laboratory Recognition
We would like to extend our appreciation for the PT samples we recently received from your laboratory. The samples were well-prepared, properly labeled, and securely packaged, which ensured their integrity upon arrival. The instructions and accompanying documents were also clear and easy to follow, making the process more efficient for our team. We commend NSI Laboratory for maintaining high standards in providing PT samples and for your continued support to our laboratory’s quality assurance program. Your professionalism and consistency greatly contribute to the reliability of our testing and accreditation compliance. Thank you once again, and we look forward to continued collaboration with NSI Laboratory.
Review Date: 23 Aug 2025 | ZeptoMetrix - Analytical Reference Materials
NSI provides quality proficiency testing materials.
Certification
Our lab uses NSI for the majority of our proficiency tests-drinking water, hazardous waste & soils. Instructions are clear, packaging/labeling is easily understood, and any issues are quickly addressed.
Review Date: 22 Aug 2025 | ZeptoMetrix - Analytical Reference Materials
Simple and easy
Wastewater treatment plant
The directions for the PT samples are extremely easy to read and follow. Not only does it explain how to store them when they come in, it also explains exactly how to do the sample. Thank you for all that you do.
Review Date: 22 Aug 2025 | ZeptoMetrix - Analytical Reference Materials
NSI is a significantly better PT resource than competitors.
To certify a water testing lab
The PT contains clear instructions, a user-friendly interface for entering results, and the reporting is quick and reliable. We have struggled with another PT provider requiring our lab to provide reagents to create samples, changing protocols, and also issuing changes on sample results after we receive our lab's results. NSI has been a significantly better fit for our lab, particularly because they offer a variety of studies each year which fit our lab schedule.
Review Date: 22 Aug 2025 | ZeptoMetrix - Analytical Reference Materials
We offer Proficiency Testing products for a variety of testing schemes for both quantitative and qualitative test performance. Proficiency Testing studies are designed for your convenience and success.
What really matters to you:
- ISO 17043 accredited PT Express™ studies on your schedule.
- Simple on-line reporting
- No limits on the number of analysts or number of methods you report
- PT Studies for Environmental, Food & Ag, Cannabis & Hemp
