Computer for a harsh environment

I am looking to purchase some computers to be used in our college’s automotive training center. They will be out on the shop floor and in dirty environments. They will be used to look up data such as schematics and parts lists light duty web browsing. They will not be connected to any kind of diagnostic equipment. Does anyone have experience with any type of “toughbook” that they can make a recommendation for? I most concerned with damage to the PC being caused by oil, dirt, grease, metal shavings, etc.