High-performance rotational viscometer is capable of both steady shear and yield stress testing in a rugged, compact footprint. Designed for performing both routine rheological tests such as single-point viscosity checks for QC, to complex rheological evaluation for R&D, the viscometer is suitable for investigating the mixing, stirring, and process flow characteristics of fluid systems. The unit comes standard with built in Peltier temperature control for all measuring systems. Cone and plate, parallel plate and concentric cylinder measuring systems are included. The measuring systems employ novel “Quick Capture” mounting technology. The gapping mechanism is highly accurate and user adjustable. The unit has an angular velocity range from 0.01 to 200 rad/s, a torque range from 0.005 to 20 mNm and a temperature range from -10° to 120° C.