You can also check OLED-Finger-Fingertip-Blood-Oxygen-Meter-Pulse-Heart-Rate-Monitor-Oximeter-SPO2 and Innovo Deluxe Fingertip Pulse Oximeter with Plethysmograph and Perfusion Index for a better comparison at Oximetersi.info.

CMS50M Fingertip Pulse LED, Lanyard black Brief 1.Introduction portable technology, it mainly checks SpO2 through the finger, provides scientific means for measurement oxygen saturation.
CMS50M applicable use plateau area, oxygen bar, Fitness clubs, physical training room, and institution, 2.Features 1) SpO2 and Pulse accurately and Pulse display,bar display low Shut signal range: Accuracy: 70%~100%: ±2% 0%~69%: unspecified measurement range: ±2bpm is 1% 1bpm Measurement Performance in Weak rate can shown correctly pulse-filling is error is ±2 bpm or greater.
Resistance to light: the value measured the of man-made light light that.
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