I'm glad the OP solved his problem!
I used to be a watch freak. I bought all sorts, each more expensive than the last. What I really wanted was a Breitling - well, cause I was a pilot.
Finally, about 20 years ago I bought a Breitling. The leather strap rotted after three months (it seems I perspire nitric acid). I paid £750 for a stainless steel bracelet. That fell apart after a few weeks, but was promptly replaced under warranty.
Then the stopwatch bit stopped working. It went back several times for that, eventually spending best part of a year at Breitling. It still doesn't work, and I've given up.
It keeps nigh on perfect time - gaining maybe one or two seconds a month. It needs a new battery every two years (I fit it myself, under a fiver).
It's showing its age a bit, but it soldiers on, and is easy to read. I reckon it'll last longer than I do.
I've never used the calculator ring in anger.