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There are three major technologies available to measure consistency. Inferred methods such as agitator motor load are also sometimes used. The major consistency measurement technologies are one, shear force, two, optical, and three, microwave. Shear force transmitters are commonly used to measure consistencies that are greater than 1.5%. In rotary type devices, the shear force is reflected as the torque required for the rotating propeller to maintain a constant speed. Blade-type consistency transmitters operate on the shear force it takes to pivot or shear the sensor blade through the stock. This force is then converted into a voltage and finally into an output.