The viscosity is measured by determining the amount of time it takes for a steady stream of sample to flow from the orifice in the bottom of the cup. This is correlated to the viscosity in centistokes.

• 44ml capacity
• 13¾” overall length
• 2½” cup depth
• 1½” cup width
• Ranges are approximate

Cup Number	1	2	3	4	5
Application	Very Thin Oil	Thin Oil or Lacquer	Medium Oil or Mixed Paints	Heavy Mixtures	Very Heavy Mixtures
Orifice Diameter, inches	0.078	0.108	0.148	0.168	0.208
Zahn Range, seconds	45-80	25-80	20-75	20-80	20-75
Centistoke Range	18-56	40-230	150-790	220-1100	460-1725+
Part Number	2854850A	2854850B	2854850C	2854850D	2854850E

How to Use Zahn Cup Type Viscometers

1. Please insert a dial thermometer into the holes of the bracket of the Zahn cup and stir the liquid thoroughly.
2. Dip the cup into the liquid, record the temperature then raise the bracket so the thermometer stem is out of the cup.
3. Place a finger in the ring, lift the viscometer completely out of the liquid and start a stopwatch when the top edge of the cup breaks the surface.
4. Stop timing when the steady flow of the liquid from the orifice suddenly breaks.
5. Repeat steps 1 through 4 until consistent results are obtained (viscosity in seconds) then clean the viscometer with an appropriate solvent and dry with a soft, lint-free tissue. 

For accuracy, each cup should have a correction factor determined by comparing to a certified standard appropriate for the cup size being used.