In article ,
 spuorgelgoog@gowanhill.com writes:
> On Sunday, 24 June 2018 11:47:17 UTC+1, Andrew Gabriel  wrote:
>> I bought a standard pulse oximeter, thinking it would be interesting
>> to observe while I'm cycling. It wasn't ...
>
> I'm told they're useful devices to have for first-aiders as they're easier to
use than trying to find a pulse.

They only work if you have a pulse, and it has to be regular.
They can't work with someone who has an irregular heart beat,
or no detectable peripheral pulse, because they have to be able
to work out precise fractions of each pulse in order to derive
the SpO2 level. Obviously, they can show an irregular pulse
(if they can see one at all), but not work out the oxygen
saturation in that case.

--
Andrew Gabriel
[email address is not usable -- followup in the newsgroup]

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