What's a pulse oximeter? Should I buy one to monitor COVID at home?

COVID-19 Positive – How To Use An Adult Oximeter – Asthma New Zealand

✅ACCURATE and RELIABLE: This oximeter can measure and monitor heart rate, SpO2 and pulse intensity with high accuracy. Displays waveform

Easy@Home Fingertip Pulse Oximeter (Not for Medical Use) - SpO2 Blood Oxygen Saturation Meter and Heart Rate Monitor -EHP050

What's a pulse oximeter? Should I buy one to monitor COVID at home?

【RELIABLE】From the ABS shell, OLED screen, acrylic panel, high-speed computing chips , anti-skip silicone inside, medical-grade silicone finger mold

Pulse oximeter fingertip, Portable blood oxygen saturation monitor for heart rate and SpO2 level, O2 monitor finger for oxygen,Pulse Ox,Oxi Include

RPM Pulse Oximeter - Tenovi Remote Pulse Oximetry

What Oxygen Level Is Too Low for COVID-19?

Do I Still Need a Pulse Oximeter at Home to Monitor Covid-19? - The New York Times

Pulse oximeter – adult

What Is a Pulse Oximeter? And Why Are People Buying Them During COVID-19?, The Hospital of Central Connecticut