SAYBOLT ASTM D 88 - ASTM D 244 - ASTM E 102
ENGLER ASTM D 1665 - DIN 51560
REDWOOD IP 70
Those testers allow the determination of Saybolt, Engler or Redwood viscosities. They do not determine absolute viscosity of petroleum products, tar or fluid products, but an empirical flow test, only by conforming to requirements of the test methods allowing results which can be reproducible.
Those testers are equipped with electric heater, digital display of temperature, stirring motor for bath temperature standardization, possibility to cool down the bath by means of an external cooling system.