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美國Fann Instrument 
美國Fann Instrument公司成立于1939年.致力于流體的物理和化學性能，特別是流動性和粘度的測試設備的設計和制造。Fann直接讀取式粘度計.
Fann Instrument Company has been the leading supplier of quality instruments for drilling fluids analysis since 1939. Fann produces and sells a broad array of instruments that help improve efficiency while reducing cost for our customers around the world.

Fann Instrument Company specializes in the design and manufacture of instrumentation for measuring the physical and chemical properties of fluids, especially the measurement of flow and viscosity. Our product line is the most comprehensive offering of instruments and accessories, test kits, and portable laboratories for testing; drilling fluids, completion fluids, fracturing fluids, oilfield cements, and industrial slurries. We also provide reagents, supplies, and replacement parts through a worldwide distribution system.