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A Rheometer is one of the commonly used devices in laboratories. It's chief purpose is to determine the direction in which a liquid, suspension or slurry flows when subjected to external force. It measures the rheology of liquids or fluids that fails to be described by a single value of viscosity, hence requiring more parameters.

The history of these devices can be traced back to the early 90's when they were used extensively to measure the flow of electric current, before being replaced by the galvanometer and the ammeter.

Modern Rheometers can be classified into two main sub categories:

  1. Shear Rheometers: Typical types of Shear Rheometers includes Pipe or Capillary, Rotational cylinder, Cone and plate and Linear Shear.
  2. Extentional Rheometers: Rheotens, CaBER, FiSER, Sentmanat & Acoustic.