How do the Blood Pressure Meter on Indiegogo work?
Today I was surfing a little on the Indiegogo website and found two projects that claim to measure blood pressure. I did see electronic blood pressure meter, but they always had a mechanical moving part. The projects on Indiegogo are as small as a watch and it looks like they don't have any mechanical moving parts. So I was wondering how this meters work and if someone has any documentation? Are thees project legit?