Flow Cups are designed to accurately measure the viscosity of paints, inks, varnishes and similar products.
The process of flow through an orifice can often be used as a relative measurement and classification of viscosity.
This measured kinematic viscosity is generally expressed in seconds of flow time which can be converted into centistokes (cSt) using a viscosity calculator.
Flow cups are manufactured using high grade aluminium alloy with stainless steel orifices (where indicated), Flow Cups are available with a range of UKAS / ISO 17025 certified standard oils to confirm the flow cup is measuring within specification.
References
Flow cups Wikipedia(Text) CC BY-SA