For the calibration, the maximum possible immersion depth and an optimum thermal coupling, respectively, is aimed at for the thermostat and the thermometer to be calibrated.
Any measures which might have to be taken are to be stated in the calibration certificate.
This prescription is intended to ensure that the calibration results are reproducible and - in recalibration - also comparable.
This procedure can call for measurement conditions different from those in subsequent use.
Any other measurement deviations must be determined and taken into account by the user.