Dear Sunisa,
All CAP viscometers are calibrated with a Master CAP-01 cone. This cone is what the certificate of calibration is based on and what sets up the linearity of the instrument. In addition to the master cone each purchased cone will have a cone calibration performed on the instrument. This cone calibration is what creates and enters in the conversion of % torque to cps. It can be done here or by the customer using the suggested fluid. No certificate for this is provided.