Oil Viscosity Standards are used during calibration checks of specific instruments such as cone/plate viscometers or rheometers as well as Krebs spindle geometry instruments.General Purpose Oil Fluids are best suited for those instruments using Cone/Plate Viscometers/Rheometers.Accuracy: +/-1% of viscosity valueAppropriate for use at shear rates greater than 500 sec-1Recommended for use with cone/plate Viscometers at viscosities above 5,000 cPBrookfield oil viscosity standards are hydrocarbon based, either mineral oil or polybutenes Note: Other oil fluids are available - call for detailsBrookfield Viscosity Standards are accurate to ±1% of the stated viscosity and are certified by methods traceable to the United States National Institute of Standards and Technology (NIST).