The Gerin Corporation produces instruments that measure viscosity and detect contaminants in lubricants. The principles established in ASTM D 445 Standard Test Method for Kinematic Viscosity of Opaque Fluids are used in this viscosity test method. The amount of potassium hydroxide needed to neutralize the acid in one gram of oil. Our products make it possible to test the acidity of transformers and other petroleum fluids quickly and easily.