Viscosity Apparatus.

Made from standard acrylic tubes with stoppers on the ends of the tubes. The stand is a piece of acrylic bent in a ''C'' shape with holes in one arm to hold the four tubes. Each tube has a steel ball and a neodymium magnet is used to hold the ball at the top of the tube until you are ready to release the ball. Packed one per box Note: The complete apparatus will come with magnets, acrylic tube and stand. The length of tube will be 20 inch long and 20 mm dia. But supplied without liquid.