A2.2.3.1 Unless otherwise listed on the certificate of calibration, the recalibration of calibrated kinematic viscosity thermometers requires that the ice-point reading shall be taken within 60 min after being at test temperature for not less than 3 min. NIST Special Publication 1088 from the NIST website describes an effective procedure for ice point verification, including all formulae necessary for calculations of change of correction and measurement uncertainty. Alternatively use Test Method E563 or those in A2.2.3.2 through A2.2.3.5.