Over and above traceability to the National Institute of Standards and Technology of the USA (NIST), the NanoStandard™ 17025 and MicroStandard™ 17025 size standards by Applied Microspheres are certified by an ISO/IEC 17025 accredited metrology laboratory. They therefore meet the criteria obligatory for instrument calibration under ISO/IEC 17025 and as such meet the highest international metrological standard available.