How often IT8 calibration?

[PJL]

Hi,

How often do you need to calibrate with the IT8 target?
Every scan?
I'm confused because the [IT8 Cal] button on the main screen, suggesting you have to you use it a lot, otherwise I would expect this button somewhere in preferences.

[LSI_Ketelhohn]

Dear customer,

You should calibrate about once every three months or when the room temperature is changing by a larger amount.

Kind regards,
Arne Ketelhohn.