The torque on a spindle rotating in a special thermostatically controlled sample holder containing a small sample of asphalt is used to measure the relative resistance to rotation.

A factor is applied to the torque dial reading to yield the viscosity of the asphalt in millipascal seconds.

Digital Rotational Viscometer Test Equipment

to be composed of:

- RV - Digital Rotational Viscometer
- Spindle Extension, including link and coupling nut
- Spindle
- Tempering Unit - RV
- Tempering Controller - RV
- PC-Software - RV
- Viscosity Standard