IEC TR 63367:2021 which is a technical report, summarises the results of a round robin on connector end face scratch recognition and verification by automated microscopes. The prime objectives of the study were:

• determine the amount of variability (repeatability and reproducibility) when different state-of-the-art inspection systems are assessed against IEC 61300-3-35:2015;
• evaluate any system-to-system variation in the quantity of reported scratches;
• provide recommendations to improve the repeatability and reproducibility of fibre optic inspection systems.