Overview
ISO 9344:2016 specifies the dimensional and quality requirements for graticules used in microscope eyepieces. It covers graticules with nominal diameters of 19 mm, 21 mm and 26 mm, defining acceptable sizes, permissible material defects and processing faults, and marking requirements for Type 1 and Type 2 graticules. The standard supports reliable measurement, assessment and comparison in microscopy by standardizing graticule form and quality.
Key topics and requirements
- Dimensions and types: Table-based dimension requirements distinguish Type 1 and Type 2 graticules (see ISO 9344 for full dimensional tables and tolerances). Protective chamfer requirements are specified in accordance with ISO 10110‑1.
- Permissible defects and processing faults: The standard specifies permitted levels for:
- Bubbles and inclusions (referencing ISO 10110‑3)
- Striae and inhomogeneities (ISO 10110‑4)
- Surface form and irregularity limits (ISO 10110‑5)
- Surface imperfections and scratches (ISO 10110‑7)
- Surface texture / roughness and waviness (ISO 10110‑8)
- Parallelism tolerance (explicit limit stated in the standard)
- A coding system (defect code × area/number) is used to express permissible counts and maximum sizes of defects.
- Marking: To identify the tighter‑tolerance variant, Type 2 graticules must be marked with “Type 2 conforming to ISO 9344” on the graticule or packaging.
- Normative references: ISO 10110 series (Parts 1, 3, 4, 5, 7 and 8) are normative and define test methods and interpretation of the defect/quality codes.
Applications and users
ISO 9344:2016 is used by:
- Graticule and eyepiece manufacturers to design, produce and mark compliant graticules.
- Quality control and inspection labs for acceptance criteria when receiving or validating graticules.
- Calibration and metrology facilities applying standardized reference marks in optical measurements.
- Microscopy laboratories and research facilities that require traceable, repeatable measurement grids.
- Procurement and specification writers who need to call out standardized graticules in purchase orders and test specifications.
Related standards
- ISO 10110‑1, ‑3, ‑4, ‑5, ‑7, ‑8 (optics drawing preparation; material, surface and texture imperfection standards)
- ISO/TC 172 (committee responsible for optics and photonics standards)
Keywords: ISO 9344:2016, microscope graticules, eyepiece graticules, graticule dimensions, permissible defects, ISO 10110, microscopy measurement standards, graticule marking.
