by far the best edc watch I ever owned was a casio that doubled as a scientific calculator. It cost about $30 at the time, and I haven't found one to replace what I had back in the late 80s but ruined with a lawn mower one day. Now I just pack a $15 casio with a standard calc function. Not as useful, but I added a $6 compass to the band that has come in handy on a regular basis. I've managed to keep the current watch on my wrist for 7 years now, and have only replaced the battery once about 2 years ago.