Panasonic's Toughbook laptops, which range from 'business ruggedised' through 'semi-rugged' and up to 'fully rugged', are known for their ability to withstand a range of challenging conditions. The Toughbook CF-33 belongs to the latter category, and is a bulky, heavy 12-inch 2-in-1 hybrid with a detachable screen. It's not cheap, starting at £2,627 (ex. VAT), but it sure is tough.
Panasonic Toughbook CF-33 review at ZDNet.com