Review on AccuMed CMS-50D1 Fingertip Pulse Oximeter Blood Oxygen Sensor SpO2 For Sports, Aviation, LED Display, Portable And Lightweight With 2 AAA Batteries, Lanyard And Travel Case (White) by Keisha Wright

Great product! VERY easy to use (open the little clothespin looking meter, insert your fingertip and press the little button on top. Reads blood oxygen AND heart rate within seconds and automatically shuts off after a minute or 2 when you take your finger out. Nice bright display, big enough to read easily (I need/wear glasses). I am not 100% positive of the accuracy, but I'm not using this to replace a hospital or doctor checkup. Seems accurate to me. THE NOTES SAY that it may not be quite as accurate with darker nails or dark nail polish users. I would buy this again. Shipped very quickly, well packaged, good seller.