This was a gift for my husband.  He had it on his wish list, so I knew he'd like it.  His coworkers tease him for being a nerd with a calculator on his watch, but he really loves it (and uses the calculator).

He bathes our son every other night and emerges this completely (in a bubble bath), and it still works beautifully.

This is a great value for the $$.  It makes a wonderful gift.