Got a FitBit Charge last month, to track how much I walk in a day
(averaging around 10k steps/day, far cry from working in my garage days!)

Anyway, the band latches with two parallel metal bars that lock into
slots in the other end. It's super easy to undo this while working on
machinery, I've done it several times. First time, while down in a mucky
pit lubing bearings. Luckily it landed on the one small crusty patch in
the corner, else I'd likely never have found it. Didn't even realize it
had come off until some time later, that's how easily it comes apart.

Made a C-clip out of strapping tape, worked great but rusts from sweat.
Bent up some SS TIG rod into a sort of clip, works but not as well as
the strapping tape version.

I could whittle out some tooling at work in my spare time, if I had any.
But I don't and work responsibilities are growing almost by the day. So
just putting this out there for anyone so inclined to service a niche
need. I can't be the only one using a FitBit in a work environment. If
anyone comes up with one, just be sure and let me know so I can buy a
couple!

Jon