is it possible to share the HRM Pro? I want to use it for indoor rowing and I would like to know if my wife could connect it to her app too whenever she is working out.
I cannot see why not? I am no expert, but there may just be issues when uploading workouts to Garmin connect though. But, why do you not just try it out and see what happens?
Yes you can, but be careful could be tricky and mix data between your wife and you. As the HRM-pro also work as a standalone tracker, data (step, HR etc.) recorded during a workout could be sync into both account :-/
FYI anyone trying this, be warned - I just paired my partners HRM-Pro with my phone and it's stuffed up my step data, adding his steps while wearing it to my daily step count for every run he's used it on :-/