Are inexpensive fingertip pulse oximeters accurate?

Consumer fingertip oximeters can give a useful at-home SpO2 trend, but accuracy varies and none of the products here came with independent lab measurements in the data we reviewed. Verified-purchase reviewers generally report consistent readings on the higher-volume models, but factors like cold fingers, nail polish, poor perfusion and movement degrade results. For any medical decision, confirm with a clinician using calibrated equipment.