When used in conjunction with the iOximeter device, the iOximeter app calculates your pulse rate (PR) and blood oxygen saturation (SpO2). The PR and SpO2 are important vital signs used through the world of medicine, sports and aviation. This app features a plethysmograph display and programmable alarms to let you know when values are too high or too low. The iOximeter App requires the iOximeter Device to operate. Please visit our official website to see find where you can obtain one..