This method covers procedure for the empirical measurement of Saybolt viscosity of petroleum products at specified temperatures between 21 and 99°C. The viscometers, available in two versions: single and two tubes, include bath, Furol and Universal orifice, key, control box, stirring device, cooling coil, 60 ml flask and digital thermoregulator. Funnel and withdrawal tube ars not included and have to be ordered separately.