You can adjust the humidity measurement in 1 … 5 points and temperature measurement in 1...2 points, depending on the device that you use for the adjustment. Note the following:
Humidity adjustment in more than 2 points is only available when you use the Insight software in Advanced Mode.
If you are adjusting in more than one humidity point, make sure the first two points are at least 10 %RH apart.
The probe will reject adjustments that are too large, that is, greater than 10 %RH for humidity and 0.5 °C for temperature. If the probe appears to need such a large correction, perform a sensor purge and repeat the adjustment procedure. Make sure that the measurement has stabilized and the reference environment is reliable. If the required adjustment is still too large, the probe needs to be serviced by Vaisala.
When adjustment of humidity measurement is necessary, Vaisala recommends adjusting in two points, 11 %RH and 75 %RH. These humidities can be produced using Vaisala HMK15 Humidity Calibrator.
Adjustment of temperature measurement is typically not necessary.