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Check the listing for details. 1pc 6.5" 50ml Portable Flow Cup NK-2 Viscosity Cup Outflow Cup Viscosity Cup New. Condition: New. Listed at 48.48 USD. NK-2 IWATA viscosity cup, Japan JIS standard, applicable to quick test of viscosity of fluid of Newton or Newton-like in job site. It's widely used for electronic ducts & plastic-used fluid. viscosity scope:70~370 cSt.