1-800-762-2478   Facebook  Twitter 

 Drum Handling
 Drying Time/Gelation
 Film Flaws
 Film Thickness
 Impact & Flexibility
 Lab Apparatus
 Measuring Instruments
 Optical Instruments
 pH & Conductivity
 Surface Profile
 Surface Tension
Home  >>  Products  >>  Viscosity  >>  Krebs Unit Viscometer Model KU-3
Krebs Unit Viscometer Model KU-3

The KU-3 Viscometer displays, Krebs units, gram units and centipoise for paints, coatings and inks.

This instrument is used widely for making viscosity measurements on paints/coatings in accordance with ASTM D562.

Krebs Unit Viscometer Model KU-2


A completely digital calculating Krebs Unit Instrument with all the reliability you'd expect...now with relative centipoise display.

  • Continuous sensing and display in Krebs units, grams, and centipoise.
  • Magnetic coupling for rapid spindle attachment and easy removal, providing time savings of 5 to 10 seconds per test.
  • Allows rapid sample measurement to determine required consistency.
  • LED Digital Display of: Krebs Units (increased resolution in 0.1 KU increments), Grams (in 1 gm increments) and Centipoise (cP).
  • Base accommodates standard pint, 1/2 pint, and quart cans.
  • The optional paste spindle is suitable for use with high consistency materials such as roller mill pastes.
  • NIST traceable viscosity standards available.
  • Protective rubber boot covers the lab stand rod, eliminating potential problems with up/down viscometer head movement during viscosity tests.
  • Universal power supply located externally to the viscometer head which eliminates potential electrical damage due to variable line voltage.
  • Single piece can adapter to accommodate pint and half-pint cans.
  • Instrument display has slightly larger alpha numeric characters. Scientific units for KU, grams, cP appear on the display.



Technical Data

Technical Data
Range: 40 to 141 KU; 32 to 1099 gm; 27 to 5,274 cP
Resolution: Within 0.1 KU or 1 gm
Accuracy: Within ±1% of full scale range
Reproducibility: Within ±0.5% of full scale range
Operating Temperature: 10°C to 40°C
Spindle Speed: 200 rpm ±0.1rpm
Measuring Containers: 1 pint, 1/2 pint, 1 quart cans
Power Line Requirement: 115 V/60 Hz
References: ASTM D562
Shipping Weight: 22 lbs. (10 kg)



  • Paints & Coatings
  • Adhesives
  • Inks
  • Pastes


How it Works


Samples are tested in standard paint industry cans held by a fixture located on the viscometer base. The can is filled to within 3/4" (20mm) of the top. The KU-3 operating lever has two positions:

Up: Spindle stationary, drive motor off
Down: Spindle rotating; sample being measured

The displayed reading can be held by depressing the HOLD switch at any time. With the viscometer in the HOLD configuration, the display may be switched to compare the Krebs unit (KU) reading with the associated gram (gm) reading, and centipoise. Brookfield Oil Viscosity Standards in Krebs units are NIST traceable and are recommended for verifying calibration of the KU-3 Viscometer.


More Information


Annual Calibration Service is Recommended - We recommend that this instrument be returned on an annual basis. Having this annual maintenance done will ensure the instrument's long life and optimal performance.

The air-purge option is not available in the Model KU-3.

Please note:

  • The cP reading from the KU-3 will not necessarily agree with cP values
    measured with other instrumentation due to:
    1. Unique shear rate of the KU-3 paddle spindle.
    2. Uniqueness of the Krebs unit scale. (The centipoise value should not be used for purposes of calibration.)
  • Use only Brookfield KU mineral oils for calibration check.
  • The cP readings will only be valid when using the paddle spindle.
  • The paste spindle may not be used to determine cP.


Conversion Between Stormer Viscometer Krebs Units and Viscosity Cup Drain Time


The three reduced size charts, at left. are only for illustrating this conversion method. Ask for complimentary full size (8-1/2" x 11") Krebs Units Conversion Charts and latest Krebs Stormer literature.

Three Step Conversion Procedure

Step 1: Knowing the Krebs value, convert this value to Centipoise viscosity. On the attached Krebs Units to Centipoise conversion chart, read vertically from the known Krebs unit to the curve and then horizontally to the left to the Centipoise value. Record this value.

Step 2: Convert the Centipoise value for the test material in question to Centistokes. On the attached Centipoise - Centistoke conversion chart, locate the Centipoise value from Step 1 on the vertical scale.Read horizontally to the right from this value to the Weight Per Gallon or Specific Gravity line, estimating values between lines, applicable to the test material in question. From this intersection read directly downward to the horizontal Centistoke scale and record this value.

Step 3: Determine the drain time in seconds for the viscosity cup in question from the Centistoke value from Step 2. For this conversion, refer to the Gardco Viscosity Cup Equivalent Chart or the conversion chart furnished with each Gardco produced viscosity cup. Only viscosity cups accommodating the highest range of viscosity are satisfactory for this conversion as most Krebs measurements are in the range from 500 to 1400 Centistokes.

For satisfactory results, do no use a viscosity cup above its recommended top limit. This conversion is accurate only for Newtonian or near Newtonian materials. Viscosity of materials that deviate greatly from these true liquids may not be “seen” the same by the Stormer and viscosity cup methods of measurement.

Please refer to the appropriate cup conversion chart. If you do not have one please contact us at 1-800-762-2478 or 954-946-9454.



Prices subject to change    Prices listed in US dollars for domestic shipments within US, Canada, & Mexico only    Export orders require quotations - click here for a quote     For more info call us 1-800-762-2478 or 954-946-9454.
Item Number Item Prices

Instrument, Krebs Spindle, Communications Port for Printer, Adapter for Pint and Half-Pint Cans
VI-021102 KU-3 Krebs Viscometer, 115V $2,824.00
TH-02280 Stormer ASTM 49C Thermometer (20-70°C x 0.2°) 62.00
TH-02280/C Stormer ASTM 49C Thermometer w/ NIST Certificate 278.00
PU-G271 Conversion charts for conversion from Kreb units to cup drain times (download PDF) FREE
Viscosity Oils
VI-028010 Viscosity Centipoise 328 / Krebs Unit KU 61 115.00
VI-028120 Viscosity Centipoise 696 / Krebs Unit KU 73 115.00
VI-028230 Viscosity Centipoise 1040 / Krebs Unit KU 87 115.00
VI-028340 Viscosity Centipoise 1582 / Krebs Unit KU 99 115.00
VI-0284 Viscosity Centipoise 2000 / Krebs Unit KU 106 115.00
VI-022310 Krebs Replacement Spindle 191.00
VI-022510 Krebs Paste Spindle 191.00


  By Category Email Registry How to Order Contact Info
  By Industry Trade Shows Request Quote History
  New Products Test Lab Info Order Form FAQ's
  Monthly Product Articles/Links Sales & Clearance Policies

  © 2019 Paul N. Gardner Company, Inc. | Contact | Policies Facebook  YouTube  Blogger