is one of several method for determining the viscosity of petroleum products; it is widely used in Europe, but has limited use in the U.S. The test method is similar to Saybolt Universal viscosity; viscosity values are reported as "Engler degrees". 

Testing is a British Standard - measured time in seconds required for 200 ml of fluid to flow through a measured tapered orifice 20mm tube into a calibrated receiver flask and report as Engler Degree (E).

Other methods include Kinematic viscosity (ASTM-D-445),  Redwood viscosity, Saybolt Furol and Saybolt Universal Seconds (SUS)..