Perry Johnson Laboratory Accreditation, Inc. provides resources including internal documents and update notifications, as well as our own technical publications and links to valuable information.

The Resources section of our website provides the following valuable information.

PJLA Documents

Visit our PJLA Documents page to view and/or download support documentation such as: checklists, policies, procedures and work instructions.

PJLA Update Notifications

Our PJLA Updates page provides notifications for all clients and assessment staff in regards to updates on PJLA documents, policies and accreditation criteria.

Technical Resources

Visit our Technical Resources page to view and/or download technical documents published by PJLA as well as valuable information from external sources such as ILAC and NIST.

  • PJLA Technical Documents
  • International Laboratory Accreditation Corporation (ILAC)
  • National Institute of Standards and Technology (NIST)

Proficiency Testing

Our Proficiency Testing page provides contact information and links to Proficiency Testing (PT) providers and links to additional PT resources.


Visit our Calculators page to download the following calculators.

  • Relative Uncertainty Equation Calculator – Weight and Force
  • Relative Uncertainty Equation Calculator – Dimensional
  • Scale Best Measurement Capability Calculator
  • Normalized Error Analysis of PT Results