[Avodah] Fitbit on Shabbos

[Micha Berger via Avodah]

On Fri, Apr 01, 2016 at 02:06:19AM -0400, R Moshe Yehuda Gluck wrote:
: And here's the link to the source sheet:
: http://cdn.yutorah.org/materials/Source Sheet-510279.pdf

RMT's discussion is of ex rays, and really focuses on whether the
developing is koseiv. (Also, mesayeia, how often is it really needed,
etc...) If anything, I would read him as assuming that the invisiable
change to the film is mutar.

:-)BBii!
-Micha