The readings are much too low, 89% in an awake healthy person cannot be true! With Apple Watch Ultra in parallel 97%! Can anyone tell me their experience?

Question

Accepted Answer

I just compared readings from Checkme O2 to measurements with  a fingertip device (medical Econet): they correspond nicely : 93-96%

Search

Question about Pulox Checkme O2

The readings are much too low, 89% in an awake healthy person cannot be true! With Apple Watch Ultra in parallel 97%! Can anyone tell me their experience?