Amazon's Top Selling Finger Pulse Oximeters are Not as Accurate as the O2Health DB11 and DB12

The following is a video testing the Nellcor N65, SantaMedical SM-110 (Made in China) and the Contec CMS50DL (Made in China)  against the O2Heath DB11 and DB11 finger pulse oximeters (Made in Taiwan).  There is a accuracy and performance difference between the different models.