The universal torsion viscometer Gallenkamp is one of the most used instruments in the ceramic field for rapid misures of suspensions viscosity and thixotropy. Manually operated and with lifting system of the sample cup, it comprises a wire with vertical torsion , a disk mounted on a graduated scale, and a cylinder suspended under the scale. During the test the disk is rotated by 360°C and then released, the braking effect of the sample on the outer part of the cylinder is used to measure viscosity. The thixotropy value is determined making a second measure after 1 or 5 minutes (in wich the sample remained in a static condition), and calculating the difference respect to the first measure.