Reminder to scientific community: Placing two optical HR wrist watches next to each other on same wrist makes me seriously question a study.

Reminder to scientific community: Placing two optical HR wrist watches next to each other on same wrist makes me seriously question a study.

Reminder to scientific community: Placing two optical HR wrist watches next to each other on same wrist makes me seriously question a study. posted first on grassroutespage.blogspot.com