The Aluratek Home Health ADPM01F Digital Pulse Oximeter is an easy to use solution to instantly view your oxygen saturation levels and pulse Rate. Simply insert your finger or thumb for a few seconds then your results will be displayed on the OLED display. The oximeter easily expands and clamps down firmly on fingers of all sizes. Features a bright digital LED display for easy result reading. Small and compact design makes the oximeter perfect for home and outdoor use while on the go.