Using Viscometer, range of petroleum products can be measured within repeatability criteria of ASTM D445, including lube oils, lube oil stocks, biodiesel, and fuel oils. Kinematic viscosity can also be calculated. Integrating touchscreen user interface into explosion proof housing, Viscometer utilizes software that provides auto validation, calibration, and built-in diagnostic options. Alarm condition may be allocated as active or inactive, with alarms notified on screen and stored in history.