As a follow up to last month's article on Calibration Proficiency Deficiency , this month we continue to examine the most common deficiencies in ISO17025 compliance.  Cutting right to the chase, this month's deficiency is the 2nd most common -  Infractions in ISO17025 Section 5.5, Equipment.  The nature of calibration requires using the proper equipment with known performance, traceability and reliable operation.  While this is clearly core to the accurate operation of calibration, ironically, the compliance violations in this area are very common.