The Marsh Funnel Viscometer is a rugged, easy to operate instrument that
is used for making rapid, on the spot measurements of drilling mud
viscosity. Marsh Funnel readings are only general measurements, but the
frequent reporting of the Marsh Funnel Viscosity will alert the mud
engineer to sudden changes in the mud viscosity that could require
corrective action. The Marsh Funnel Viscosity is the ratio of the speed
of the mud as it passes through the outlet tube (the Shear Rate) to the
amount of force— the weight of the mud itself, which is causing the mud
to flow (the Shear Stress). Marsh Funnel Viscosity is reported as the
number of seconds required for one quart of mud to flow out of a full
Marsh Funnel. Shipping wt. 5 lbs (2kg)