R.T. Corp (DBA: RTC) was incorporated in 1988 as an S-Corporation in the state of Wyoming. We are a National Voluntary Laboratory Accreditation Program (NVLAP) (Labcode 200393-0) accredited Proficiency Testing Provider under the National Institute of Standards of Technology. In 2004, we also received accreditation by the American Association for Laboratory Accreditation (A2LA) (Certificate #2122.01) for both our soil and water proficiency testing programs. The principal business of the corporation is the manufacture of Certified Reference Materials (CRM), Quality Control (QC) Samples, and Performance Testing Samples (PTS). In conjunction with the production of these products, Laboratory Proficiency Testing Programs (LPTP) are conducted for both solids and waters.R.T. Corp (DBA: RTC) was incorporated in 1988 as an S-Corporation in the state of Wyoming. We are a National Voluntary Laboratory Accreditation Program (NVLAP) (Labcode 200393-0) accredited Proficiency Testing Provider under the National Institute of Standards of Technology. In 2004, we also received accreditation by the American Association for Laboratory Accreditation (A2LA) (Certificate #2122.01) for both our soil and water proficiency testing programs. The principal business of the corporation is the manufacture of Certified Reference Materials (CRM), Quality Control (QC) Samples, and Performance Testing Samples (PTS). In conjunction with the production of these products, Laboratory Proficiency Testing Programs (LPTP) are conducted for both solids and waters.