There are less than a handful of climatised laptops available. The Fujitsu Toughbooks are pretty much your only choice worldwide. In the US, you have some militarized units, but these have long delivery times and may not be your option.
For you, only the Toughbook may be the option.
I'm currently living in Sri Lanka and will be leaving in August to The Hague to do my masters, for which I am planning on buying a notebook. Could you give me some advice about buying a notebook for a reasonable price, good brand etc? My main concern is buying a climatised one and I was wondering what I need to check for when doing so, or if this is necessary at all? Look forward to hearing from you.