viscometer

/vɪˈskɑmɪtər/
noun
  1. An instrument used to measure the viscosity (thickness and resistance to flow) of a fluid.
    • They dropped a ball into the liquid and timed its fall using a simple viscometer.
    • A viscometer is essential for quality control in the paint industry.
    • The lab technician used a viscometer to test the thickness of the motor oil.