The Nonin Onyx Vantage 9590 is the preferred digital pulse oximeter of medical professionals in many different fields, including primary care physicians, first responders, dentists and emergency rooms. As the newest member of the Nonin line of digital pulse oximeters, the 9590 is easy to use and provides quick and accurate blood oxygen saturation levels and pulse readings to individuals with medical conditions such as sleep apnea and COPD. The durable construction of the Onyx Vantage 9590 also makes it the ideal choice for sports enthusiasts who regularly attain higher than average altitudes, including skiers and rock climbers