![]() Certification with compliance to ANSI/NCSL Z540 or ISO/IEC 17025, ISO 9001, as applicable, is available at our Gardco Service Department. Manufacturing procedures include calibration with oils traceable to the National Institute of Standards and Technology (NIST). Not all S90 Zahn Cups deviate from the standard by the same amount - the range being from near compliance to a variance exceeding a factor of two.
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