The SHELL CUP VISCOSITY CUP is a simple, reliable device for measuring the viscosity of a wide range of fluids. Superior to the Zahn Cup Viscosity cup because of their sensitivity and because they do not "dribble", Shell Cups Viscosity Cups are available in eight different sizes for viscosity ranges from 0.3 to 7000 cps (cps = Centistokes x S.G.).