Acc U Rate® CMS 50D Pulse Oximeter with Silicon Cover, Neck/Wrist cord and Batteries

The Acc U Rate® CMS 50D deluxe pulse oximeter uses the same technology embedded in the CMS 50 DL pulse oximeters (B00COQJ90A) to measure your SpO2 (oxygen saturation) and pulse rate. But most importantly, it features an additional plethysmograph that indicates blood flow. How does the plethysmograph work?Each wave corresponds to a heart beat and