What is the usage of capillary viscometer?

A Capilliary Viscometer measures the speed at which a lquid can be forced through a narrow tube (a capillary). Thicker liquids (high viscosity like treacle) will take a lot longer to squeeze through the tube than a thin liquid (like white spirit). If you take a fluid (liquid) like blood it could be put through a Viscometer like this to see if your blood was too thick or thin. Also it could be used to check if your engine oil met up to spec. Big Subject!!!! Contact me if you want to know more...