Yes, it can. the -20-120°C and 0-350°C in my unit came factory calibrated, but only the first was activated. The 1200°C case still can be used without calibration.
Enabling these settings is the easiest thing in these cameras, all you need to do is activate the network mode, enter the camera IP in your web browser(iexplore works better) and enter the service menu. Then, use the flir/3vlig login and go Calibration - System Calibration - Enable/Disable Cases. I suggest you also go to Image Correction - Select Case and select the case you want to the camera use at boot.