The Metrology Blog
In-depth articles on calibration science, measurement uncertainty, accreditation standards, and professional development — written for the metrology community.
Every article on this blog is grounded in recognized international standards — ISO/IEC 17025:2017, NIST GUM, ASQ CCT, NCSLI Recommended Practices, and A2LA guidance — the same authoritative sources that power the MetTutor learning platform.
Topics & Subject Areas
From foundational concepts to advanced laboratory management, MetTutor Blog addresses the full spectrum of professional metrology education.
GUM methodology, Type A and B evaluations, uncertainty budgets, coverage factors, TUR, and guard banding — the mathematical language of measurement quality.
Clause-level guidance on laboratory quality management, personnel competency, metrological traceability, calibration certificates, and nonconforming work.
Calibration methods, reference standards hierarchy, measurement traceability chains, calibration intervals, and domain-specific procedures for dimensional, electrical, pressure, temperature, and more.
Strategic study guidance, Body of Knowledge breakdowns, practice problem walkthroughs, and exam-day strategies for ASQ Certified Calibration Technician candidates.
Accreditation readiness, internal auditing, corrective action, document control, proficiency testing interpretation, and quality system implementation for laboratory directors and quality managers.
Workforce development, technician onboarding, competency documentation, continuing education, and the broader challenge of building and sustaining a qualified measurement science workforce in America.
Standards-Grounded. Practitioner-Focused.
The MetTutor Blog is written for working metrology and calibration professionals — technicians, engineers, laboratory managers, and quality professionals who need accurate, actionable, and technically rigorous content they can trust.
Every article is developed in alignment with the same authoritative standards and references that power the MetTutor learning platform and its MetLibrary knowledge base. You will not find generic, unattributed content here. Where a standard applies, we cite it precisely.
Topics span the full professional development lifecycle — from foundational metrology concepts for newcomers to advanced compliance and laboratory management guidance for experienced professionals preparing for accreditation assessments or leadership roles.
- ISO/IEC 17025:2017 General requirements for calibration and testing laboratory competence. The global accreditation standard.
- NIST GUM Guide to the Expression of Uncertainty in Measurement. JCGM 100:2008 / NIST TN 1297.
- ASQ CCT BoK Certified Calibration Technician Body of Knowledge. The framework for the CCT examination.
- NCSLI RP-1–12 NCSLI Recommended Practices. Calibration intervals, measurement assurance, and laboratory guidance.
- ANSI/NCSL Z540.3 Requirements for the Calibration of Measuring and Test Equipment. Decision rules and TUR guidance.
- VIM / JCGM 200 International Vocabulary of Metrology. Authoritative definitions for all measurement terminology.
- A2LA P102 A2LA Policy on Measurement Uncertainty. Accreditation body guidance on uncertainty reporting.
Written for the Measurement Community
Practical guidance on procedures, uncertainty, documentation, and certification.
Advanced technical content on measurement systems, uncertainty analysis, and standards compliance.
Accreditation readiness, quality system management, and personnel competency frameworks.
Standards alignment, measurement system analysis, and laboratory oversight essentials.
Foundational metrology concepts explained clearly, with the rigor professionals expect.
