My company is a design and build manufacture of multi-feature variable gaging systems. We build anything from stand alone bench gages to fully automated PLC type in line machines for dimensional measurement. We integrate technologies such as LVDT, capacitiance, eddy-current, laser, temeprature sensors, weigh scales, force, etc. We do not manufacture gaging such as ring gages, flush pin gages, dog-house type, etc. We have been removed from the bid-list of one major automotive plant because we are not Guide 25 /17025 accredited. I have written the buyer at this facility a letter stating that I will only use an accreduted laboratory for the calibration and certification of the gage steeing master used to set our equipment. They are unwilling to change their decision at this point. I do not beleive that the tent of ISO 900 Calibration Services 4.11.2.b.1 was written for an organization such as mine. The question is, where do I find written clarification on who is required and who is not required to hold the ISO/IEC Guide 25 / 17025 accreditation?