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RVI 4 VP20 is a rotational viscometer used in industrial and research applications to measure viscosity according to the Brookfield method. Featuring a simple, lightweight construction for ease of portability, this digital viscometer can be used in the laboratory or in the field. This viscometer is delivered with spindles R2, R3, R4, R5, R6 and R7 and displays measurements in millipascal-second (mPa.s).

Basic operation
To turn on the viscometer, press and hold the enter button for 2 seconds. Once the display shows the rotational speed, the current viscosity, the selected spindle, the battery status and the full scale percentage, press the up or down buttons to find the applicable spindle and press the enter button to start the measurement. Be sure your sample is in place before pressing the start button, as the start button begins rotation of the spindle. When you have finished your viscosity test, press enter to stop the measurement and the rotation. 

Viscometer RVI 4 VP20

  • Rotational speed

    20 rpm

    Torque range

    Viscosity range

    Rotational viscometer (RV) 

    Millipascal-second (mPa.s)

    200 ... 200,000 mPa.s


    General specifications


    Accuracy ± 2% full scale (FS)
    Repeatability ± 1% FS
    Power supply 4 x AA LR6 or R6 batteries (6 V)
    Battery life Up to 30 hours of continuous operation
    Operating temperature +10 ... +40 ° C / +50 … 104 ° F
    Relative humidity < 80%, non-condensing
    Maximum altitude 2,000 m / 6,561 ft above mean sea level
    Approx. dimensions 170 x 110 x 410 mm / 6.7 x 4.3 x 16.2 in
    Approx. weight 1.8 kg / 4.0 lbs
    Protection class IP20
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