The torque required to rotate a spindle immersed in the specimen is measured and converted to dynamic viscosity. Gilson offers rotational viscosity systems for accurate and repeatable viscosity measurements with greater speed and efficiency than traditional time-consuming glass capillary methods. These Viscometer models are easy to operate, automatically collect test data, and are accurate to ±1% and reproducible to ±0.2%. Precision temperature control units and a wide range of sample chambers and spindles are available, purchased separately.