Dr trust USA professional series pulse rate and alarm function USFDA and CE approved: The newly upgraded Dr Trust Finger Pulse Oximeter is an affordable and accurate way to check pulse rates and blood oxygen saturation levels. Simple one-button design allows for easy operation. Small portable size makes it easy to handle and carry. Helpful for athletes and pilots to obtain quick and accurate oxygen saturation readings. This is the best pulse oximeter available for medical professionals. The product is water resistant and contains audio visual alarm. USFDA and CE approved. Dr Trust is a registered trademark of Nectar Biopharma Private Limited. We will actively and aggressively pursue any parties who infringe on our intellectual property rights to the maximum extent allowed by the law. All p.