Ha Ha!! My original 7510 took a dunk.
I was potty training my daughter and my BB was in my shirt pocket (I know, I know - I was asking for it), my daughter slipped and I dove to catch her, the BB slipped from my pocket and in the drink it went. - A fishin' I did go. Now, my daughter did not get a chance to go potty yet, so it was clean, but soaked.
I pulled the battery out, took to back off, and used a cloth and compressed air to dry it as much as I could. I let it sit for several days and put the battery back in the BB, crossed my fingers and - *presto* - it worked like a charm.
Once again, I must say - excellent build quality on these devices.