We have over 25 years of experience with viscosity cup calibration.  We
calibrate Ford, Fisher, Zahn, Signature Zahn, NK2 viscosity cups.  
Because temperature is so critical to a proper calibration, all viscosity
standard oils are maintained in a circulating water bath at exactly 77
degrees F.  Our lab is also temperature controlled to 77 degrees F which
is of high importance when calibrating Ford cups.  We can provide
correction factors for all your cups which will allow you to make accurate
readings.  All calibrations are performed per our ISO 17025 Quality
System which has been assessed by A2LA.  A2LA accredited calibration
certificates are available.