The present invention relates to a cost-efficient, portable and disposable device for monitoring the quality of the oil "on field" and represents a valuable alternative to expensive and less quick traditional systems. We believe that the herein described viscosimeter can be useful for monitoring the quality of cooking oils used in restaurants and public places wherein frying oils are repeatedly used, or when it is necessary to check and validate the oil excellence following the suspected addition of lower quality oils. In addition to the food sector, the invention can be applied in industrial plants for monitoring viscosity variations following chemical/physical treatments (as for instance for assessing the efficiency of regeneration processes)
