01
Method or historical setup
If a specification or established test names the instrument, spindle and speed, reproduce that setup. This preserves comparability with earlier results and customer requirements.
Viscometers & Accessories
Laboratory rotational viscometers and accessories for viscosity testing. Select by method, torque range, spindle, speed, temperature and sample volume.
Viscometer buying guide
A viscosity result belongs to a complete test condition
For comparable results, define the viscometer model or torque range, spindle, speed, temperature, container and sample preparation together. A viscosity value without those conditions may not reproduce the same test.
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Viscometer buying guide
Five choices to define before selecting a viscometer
02
Viscosity and torque range
Give the expected minimum and maximum viscosity. Brookfield guidance recommends choosing spindle and speed combinations that keep the reading between 10% and 100% torque.
03
Spindle and speed
Higher-viscosity samples generally require a smaller spindle and/or slower speed. Non-Newtonian samples can report different apparent viscosity when spindle or speed changes.
04
Temperature and container
Temperature, container diameter, sample volume, immersion depth and air bubbles affect results. State the controlled temperature and any small-sample limitation.
05
Accessories and records
List spindle set, stand, guard leg, temperature probe or bath, small-sample adapter, data export and calibration-standard needs. Compatibility is model-specific.
Include this in a viscometer request
- Method or existing Brookfield setup
- Expected viscosity range and units
- Sample type and non-Newtonian behavior
- Test temperature and sample volume
- Required spindle, speed and accessories
- Data output and calibration-check needs
Brookfield viscometer FAQ
How do I choose spindle and speed?
Use the combination required by the method when one exists. For an unknown sample, Brookfield recommends adjusting spindle and speed until the displayed torque is between 10% and 100%, then keeping the condition consistent for comparable tests.
Why does viscosity change when speed changes?
Many materials are non-Newtonian, so measured apparent viscosity depends on shear conditions. Report the spindle, speed, temperature and other test conditions with the result.
Can I compare results from different containers?
Container geometry can change the measurement, particularly with standard spindles. Use the specified container or document its dimensions and validate the method before comparing results.
Related measurement categories
Official Brookfield references
The test-condition and torque guidance comes directly from AMETEK Brookfield. Exact range and accessory compatibility are verified for the quoted model.
- Viscosity & Rheology FAQ (AMETEK Brookfield)
- Viscometer model selection (AMETEK Brookfield)
Results depend on the complete method and sample behavior. Never infer a suitable range, spindle or accessory from the product name alone; verify the current manual and range table.