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They are a market leader in high-quality, innovative Inorganic and Organic Analytical Reference Materials, as well as PT and PT Express. They provide customers with superior products, expertise, and unmatched customer service.

Metuchen, NJ 08840
United States



Environmental Wastewater Standards


NSI has the standards to support your wastewater testing with full confidence. Unique product concepts include pre-measured, single-use reference materials that prevent laboratory errors and ready-to-use CRMs requiring no preparatory steps to save time and effort.  

Innovative Food Chemistry & Microbiology PT Studies

Food & Beverage

Elevate your confidence in food safety testing with PT studies designed for your convenience and success. Meet FSMA laboratory accreditations for analysis of food requirements with NSI’s lineup of products.

Proficiency Testing for Quantitative and Qualitative Test Performance

Cosmetic/Personal CareFood & BeverageWater

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 are proud to offer NSI ISO-17034 accredited proficiency testing for Environmental, Food Science, and Cannabis labs. Scheduled PT are available throughout the year.

Achieve Confidence in Microbiology Testing

Food & BeverageWater

NSI is a globally trusted brand for laboratory quality control standards and proficiency tests. Use of Certified Reference Materials (CRMs) and Proficiency Tests (PT) Standards on a routine basis to monitor analytical performance will defensibly document data quality and support accreditation requirements.

Accelerate Innovation with Custom Reference Materials

Food & BeverageOtherWater

Reduce workload and increase efficiency in your laboratories with our custom organic, inorganic, and microbiology reference materials. Spex® CertiPrep is here to help you with exactly what you need. Check out our new online quoting tool to get your custom project started.  

The Broadest Selection of Cannabis CRMs and PT


Spex offers the broadest selection of analytical standards and proficiency testing for cannabis and hemp so you can ensure accuracy in your cannabis analysis. We offer ISO 17034-Certified Reference Materials (CRMs) for all of the common contaminants such as pesticide residues, residual solvents, heavy metals, etc.

Microbiology Product Areas

Food & Beverage

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Proficiency Testing Schemes Show all suppliers