Hi the reading in this little gadget is always good for Mr M but when I do me the oxygen level reading is always ok but the pulse rate is really odd 20 - 24 ??!! I know I’ve got a pretty slow resting heart rate (55 ish) from my activity tracker watch, but why is the oximeter reading always so low??
Not reliable for pulse if you have poor circulation, try warming your hands in warm water and see if it changes. if it doesn't it may be you just have a weak peripheral pulse. Check it manually.