Secondi universali Saybolt

Sabolt Seconds Universal (SSU), otherwise known as Saybolt Universal Seconds (SUS) is a unit of viscosity measurement. This value refers to the amount of time (in seconds) it takes and a measured quantity of liquid to drain from a kinematic viscometer.

For thin liquids like water, oil, or paint - kinematic viscometers can be used. The simplest versions feature a cup with an orifice at the bottom. The cup is filled and then a time measurement is taken.