This Fingertip Pulse Oximeter is the perfect choice for on-the-spot SpO2 and Pulse Rate measuring and monitoring. With digital blood oxygen and pulse sensor meter, this device provides you fast and accurate reading of your real time Oxygen Saturation of Arterial Hemoglobin and Pulse Rate, and the Strength and Regularity of your pulse are indicated by the Bar Graph and Waveform on the display. The universal finger clip allows the oximeter to fit a range of finger sizes from pediatric through to adult. It turns off automatically when a finger is removed. This Finger Pulse Oximeter is approved by FDA and can be used without medical prescription by a variety of sports enthusiasts, including mountain climbers, hikers, skiers, bikers, as well as by those who have the need to measure and monitor oxygen saturation and pulse rate/strength/regularity. Measure and monitor blood oxygen saturation levels (SpO2) and pulse rate in seconds with high accuracy. Show the reading in numbers as well as the waveforms (plethysmograph) and bar graph to give visual indication of the irregular, weak heartbeat or incorrect reading. NOTE: This Finger Pulse Oximeter is not a medical device. It is the perfect choice for on-the-spot SpO2 and Pulse Rate measuring and monitoring in sport and aviation use, such as mountain climbing, high-altitude activities and running.