How accurate are smartwatch SpO2 readings?

Wrist-based SpO2 sensors are generally accurate within 2-4% for most users but can be less reliable during movement, on darker skin tones, or in cold conditions. They are best for trend monitoring, not clinical decisions.

Should I buy a pulse oximeter for home use?

A pulse oximeter is a useful home health tool, especially for people with respiratory conditions, sleep apnea, or during respiratory illness. The low cost of fingertip devices makes them worthwhile for any household.

Best Pulse Oximeters for Home Blood Oxygen