Eurotek Pro in the mail, quick question

I should know this after so many hours of reading, but I want to be clear. I know this isn't a machine that can be heavily rained on or submerged. Can someone who knows please detail how much moisture exposure the coil itself can take? Wet grass? Creek edges? 3 inch submersion in shallow creek? Thanks in advance, my brains kicked out a few details it should have held onto!