May 2026 Updates: New Standards in Metrology and Measurement Technology

Metrology and measurement professionals have significant updates to review this May 2026, as five new international standards have been published by ISO and CEN. Covering a range of topics from dimensional measuring equipment and surface texture evaluation to modern vocabulary for geodetic and surveying instruments, these updates are poised to impact manufacturing quality control, calibration labs, surveyors, and advanced engineering environments. In this first installment (Part 1 of 2), we highlight these critical standards, summarizing their key requirements and practical implications for industry practitioners.

Overview / Introduction

Precise measurement underpins progress in engineering, scientific discovery, manufacturing, and construction. As new technologies and evolving quality requirements drive higher accuracy, international standards remain the cornerstone of trust and interoperability. Metrology and measurement, specifically the understanding and management of physical phenomena, demand robust specifications and consistent terminology.

In this article, you will:

• Learn about five pivotal standards newly published in May 2026
• Understand their technical scope and latest updates
• Gain insights on compliance timelines, benefits, and risks
• Access practical tips for integrating these standards into your processes
• Directly access each standard via iTeh Standards

Detailed Standards Coverage

ISO 1938-1:2026 - Plain Limit Gauges of Linear Size

Geometrical product specifications (GPS) — Dimensional measuring equipment — Part 1: Plain limit gauges of linear size

This updated edition of ISO 1938-1 lays out the requirements for the most critical metrological and design characteristics of plain limit gauges used for linear size verification. The standard categorizes different limit gauge types (from cylindrical plug gauges to rod gauges), provides design and metrological requirements, and specifies maximum permissible limits (MPLs) for new and worn states across a measuring range up to 500 mm.

ISO 1938-1:2026 also offers methods for using limit gauges, including how to provide conformance evidence and verify the dimensional specifications of rigid workpieces. Coverage extends to the application of the GPS matrix model, ensuring alignment with the broader ISO GPS system and the latest technical terms.

Key requirements include:

• Definitions for maximum/least material limits, specification limits, and selection of GO/NO GO gauges
• Design and metrological characteristics for various gauge types (A–K)
• Methods to establish MPLs for internal and external features
• Guidance on conformance and marking practices
• Integration with ISO 14405-1, ISO 286-1, and ISO 1101

Who should comply: Production engineers, calibration labs, quality managers in manufacturing, suppliers of measuring instruments, and procurement teams responsible for metrology assets.

Practical implications: The standard clarifies acceptance criteria for linear size verification, supporting improved quality control and reduced risk of out-of-tolerance parts.

Key highlights:

• Expanded definitions and detailed requirements for new and traditional gauge types
• Updated calculation methods for maximum permissible limits
• Improved alignment with the ISO GPS matrix model and related standards

Access the full standard:View ISO 1938-1:2026 on iTeh Standards

EN ISO 12179:2026 - Calibration of Contact (Stylus) Instruments (CEN)

Geometrical product specifications (GPS) - Surface texture: Profile - Calibration of contact (stylus) instruments (ISO 12179:2026)

This European-adopted ISO standard (EN ISO 12179:2026) specifies procedures for calibrating and adjusting contact (stylus) instruments designed for measuring surface texture by profile methods. It gives comprehensive protocols for verifying metrological characteristics and calibrating both basic and operator-level stylus instruments—whether or not they conform fully to ISO 25178-601.

The standard defines steps for residual, vertical, and horizontal profile component calibration, as well as for calibration of the instrument’s coordinate system. It references the use of traceable measurement standards, with updated guidance and examples for calibration certificates and uncertainty estimation.

Who should comply: Laboratory technicians, calibration providers, equipment manufacturers, and end-users of stylus-type profilometers or roughness testers.

Practical implications: Conformance ensures traceable, reproducible measurements of surface finish, which is critical in fields like automotive, aerospace, and precision manufacturing.

Key highlights:

• End-to-end procedures for stylus instrument calibration and adjustment
• Normative annex for simplified operator instruments
• Updated uncertainty estimation guidance and calibration documentation requirements

Access the full standard:View EN ISO 12179:2026 on iTeh Standards

EN ISO 25178-606:2026 - Non-Contact (Focus Variation) Instruments

Geometrical product specifications (GPS) - Surface texture: Areal - Part 606: Design and characteristics of non-contact (focus variation) instruments (ISO 25178-606:2026)

As surface characterization advances beyond contact methods, EN ISO 25178-606:2026 defines design and performance requirements for focus variation instruments, widely used for non-contact areal surface measurement. The standard clarifies terms related to focus variation, instrument architecture, and metrological characteristics, providing a foundation for reliable 3D topography measurement.

It covers both focus variation without pattern illumination and with fixed pattern illumination, explicitly excluding systems that employ varying pattern illumination during measurement. Annexes provide further explanation of components, error sources, and the relationship to the broader GPS standards matrix.

Who should comply: Research labs, manufacturers of optical metrology equipment, and industries relying on 3D non-contact measurement (medical devices, microelectronics, toolmaking).

Practical implications: Standardized methods enable inter-laboratory consistency and comparable results using focus variation, which is critical as 3D surface assessment becomes routine in industrial and research settings.

Key highlights:

• Comprehensive terminology for focus variation and non-contact measurement
• Performance and design criteria for instrument manufacture and use
• Guidance on managing sources of measurement error

Access the full standard:View EN ISO 25178-606:2026 on iTeh Standards

ISO 12179:2026 - Calibration of Contact (Stylus) Instruments (ISO)

Geometrical product specifications (GPS) — Surface texture: Profile — Calibration of contact (stylus) instruments

This new third edition of ISO 12179:2026 offers an authoritative global method for calibrating and adjusting the metrological characteristics of contact (stylus) instruments, paralleling the CEN adoption but designated for international application. Notably, this revision introduces updated methods for estimating measurement uncertainty and improved calibration protocols for surface roughness profile instruments.

Annex B addresses the calibration of simplified operator instruments—devices not fully conforming with ISO 25178-601—which allows broader, practical uptake in a range of industrial labs and on-site quality stations. Detailed procedures ensure results are traceable and comparable, a vital feature for global supply chains.

Who should comply: International manufacturers, calibration laboratories, and all organizations using stylus-based surface profilometers.

Practical implications: Compliance guarantees that surface roughness data are trustworthy—reducing risk in automotive, aerospace, and high-precision assemblies.

Key highlights:

• Detailed calibration and adjustment procedures for stylus instruments
• Focused annex on simplified operator instruments
• Enhanced uncertainty estimation and certificate protocols

Access the full standard:View ISO 12179:2026 on iTeh Standards

ISO 9849:2026 - Geodetic and Surveying Instruments — Vocabulary

Optics and optical instruments — Geodetic and surveying instruments — Vocabulary

ISO 9849:2026 delivers an updated, harmonized vocabulary for geodetic and surveying instruments. Reflecting modern instrumentation, this edition introduces new definitions (such as GPR, UAV, range camera, and marker pole), expanded sub-categories for GNSS and 3D laser scanners, as well as editorial corrections to existing terms.

The vocabulary covers instruments like distance meters, levels, theodolites, GNSS receivers, total stations, laser scanners, and airborne sensors, including associated components and accessories. It supports uniform communication among surveyors, metrologists, manufacturers, and regulators engaged in land, topographic, and construction surveying projects.

Who should comply: Surveying equipment manufacturers, metrology professionals, engineering consultants, and legal authorities in surveying and land registry.

Practical implications: Provides a standardized language that enhances clarity in technical documentation, contracts, procurement, and international collaboration.

Key highlights:

• Expanded vocabulary reflecting latest industry advances
• Definitions for GNSS, 3D laser scanners, and accessory equipment
• Supports drafting of new standards and regulatory documentation

Access the full standard:View ISO 9849:2026 on iTeh Standards

Industry Impact & Compliance

For businesses and professionals across manufacturing, calibration, research, and surveying, these May 2026 standards represent a step-change in measurement assurance and traceability. Compliance timelines will depend on industry risk profiles and contractual or regulatory obligations but early adoption brings distinct benefits:

• Assured measurement reliability across supply chains and labs
• Consistent terminology for contracts, quality documentation, and regulatory filings
• Traceable and repeatable calibrations for metrology equipment (both contact and non-contact)
• Reduced risk of non-conforming parts or missed tolerances

Non-compliance can lead to increased measurement uncertainty, process failures, audit findings, and potential contractual disputes—especially as customers increasingly reference the latest international standards.

Industry leaders are advised to:

1. Review procurement and calibration contracts for references to new editions
2. Update internal quality documentation and training
3. Engage with calibration providers to verify alignment with the latest protocols
4. Monitor regulatory guidance on referenced standards

Technical Insights

Common technical requirements:

• All measurement systems and instruments should be calibrated using traceable standards and procedures
• Maximum permissible limits (MPLs) must be observed for both equipment design and ongoing use
• Metrological uncertainty should be quantified and, where possible, minimized and documented
• For surface texture, both contact and non-contact (areal) methods are supported, but their calibration and validation must follow the respective standards
• Standardized vocabulary enables more effective communication, thorough documentation, and supports future digitalization initiatives (e.g., Digital Twins)

Implementation best practices:

• Conduct a gap analysis between legacy procedures and new requirements
• Document all calibration results, including certificates and uncertainty data
• Regularly review staff qualifications and training on updated standards
• Engage in industry benchmarking to ensure best-in-class compliance

Testing and certification considerations:

• Choose accredited calibration labs and equipment suppliers referencing ISO/CEN editions from 2026
• Capture evidence of conformity (traceability chains, certificates)
• Prepare for external audits by maintaining up-to-date standard operating procedures

Conclusion / Next Steps

May 2026 marks a key point in the evolution of metrology and measurement standards. With the release of five critical international standards, organizations now have robust, up-to-date guidance for verifying dimensions, calibrating surface measurement systems, deploying modern geodetic instruments, and speaking a standardized technical language.

Take the following steps:

• Evaluate your current measurement and calibration processes
• Update quality management and procurement requirements
• Train staff in the implications of the new standards
• Download full standards from iTeh Standards to ensure authoritative guidance
• Stay alert for Part 2, where additional standards from this publication month will be reviewed

By embracing these updates now, your organization will position itself for compliance, efficiency, and excellence in the precision-driven world of metrology and measurement technology.