Low-cost rotational viscometer with digital readout that was well-suited for measuring viscocity was constructed with two dc motors, a rotor, a measuring cup, and milivolt recorder. This rotational viscometer can be used for quick, unsophisticated tests and comparative measurement. The viscometer requires no further calibration once it is set. Calibration with Newtonian substances indicates data in milivolts or in volts.
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Seçki̇n et al. (1996) studied this question.