A:AnswerAfter purchasing new the Fitbit 3 died on me in less than 2 months (experienced certain trouble after only one month). Very disappointed with the 3. I had some medical issues and was unable to address. Also, the 3 was advertised as waterproof and that you could swim with but never did.
I actually preferred the 2 to the 3 Fitbit.
A:AnswerWhat exactly is in your tattoos? Huge amounts of metal? It just needs to be in contact w/ living skin, where it can get a sense of body temp, blood flow & pluse. You don't see them on ankels often b/c of the movement from walking & a few other things makes readings irratic, for instance.
TLDR: Yes, unless there's something really unusual going on, it should be just fine w/ your tats.
A:AnswerIt looks like the Dexcom provides a compatibility page. From that, it looks like only Apple and Android smart wearables are compatible. So no, the Fitbit smart watches are not compatible.
A:AnswerNo, but you probably don't want a wrist-wearable to monitor blood oxygen as they aren't very accurate. Buy an inexpensive finger one - it will do a better job.
