All Stainless Steel
- Calibration of the S90/Zahn cups match the earlier Zahn Signature cups.
- Conversion formulas and tables relating cup efflux time in seconds to viscosity in centistokes are identical for both series of cups.
- S90/Zahn cups qualify for certification under ANSI/NCSL Z540-1 or MIL-STD-45662A, as applicable.
- S90/Zahn cups are calibrated with standard
- "G" series oils traceable to the National Institute of Standards & Technology. "G" series calibration oils are produced in accordance with ISO 9002*.
*NOTE: Efflux time from these cups does not meet ASTM specifications, but tables are available for converting S90/Zahn cup efflux time to EZ™ Zahn cup efflux time which complies with ASTM D 4212.
Certificate of Calibration available at additional charge for all cups.
| S90/Zahn Cup Part # | Cup # | Seconds Range | Centistoke Range |
| 61000.001 | 2 | 31 to 60 | 15 to 78 |
| 61000.002 | 3 | 19 to 60 | 39 to 238 |
