>>Probably a load of carp,
I recently asked my son re these type of offerings.
He would not go near them.
" Look at what the big boys have to offer !"
I have two expensive wrist BP monitors and they work on the inside of the wrist
All the pulse oximeters work on the fingertip. I have a cheap and an expensive one.
Some of the above are supplied to me FOC for research reasons.
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