S90 Zahn Viscosity Cups qualify for certification under ANSI/NCSL Z540 or ISO/IEC 17025,
Zahn cups are calibrated with standard "G" series oils traceable to the National Institute of Standards & Technology (NIST).
CALIBRATION CERTIFICATE NOT INCLUDED,.
If you require a calibration certificate, consult before making the purchase and it has an additional cost from the manufacturer.
NOTE: Efflux time from these viscosity cups does not meet ASTM specifications. Tables are available for converting S90 Zahn cup efflux time to EZ Zahn cup efflux time which complies with ASTM D4212.
Ransom & Randolph recommends the S90 Zahn Viscosity Cups as the most reliable viscosity cups to measure and control the consistency of ceramic shell slurries.
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