Why would a pulse oximeter not work

Be conscious that numerous factors can affect the precision of a Spo2 Probes interpretation, such as poor movement, skin coloration, skin breadth, skin temperature, current tobacco use, and use of fingernail polish. To get the finest interpretation from a Spo2 Probe bought from a Spo2 Probe Supplier:
Track the manufacturer’s orders for use.
When placing the Spo2 Probe on your finger, make it unquestionable your hand is warm, tranquil, and clasped below the level of the heart. Eliminate any fingernail polish on that limb.
Sit motionlessly and do not transfer the part of your body where the Spo2 Probes is situated.
Pause a few seconds until the interpretation stops changing and shows one steady number.
Write down your oxygen plans with the day and time of the interpretation so you can easily track deviations and report these to your healthcare provider.
How to understand a reading:
When taking Spo2 Probes measurements, pay care to whether the oxygen level is lesser than earlier measurements, or is lessening over time. Variations or drifts in measurements may be more expressive than one single measurement. Over the counter, Spo2 Probes that you can buy at the store or online from Spo2 Probe Dealers are not envisioned for medical purposes.
Do not trust only a Spo2 Probe to evaluate your health condition or oxygen level.