The ADC Diagnostix 2100 Adult Digital Fingertip Pulse Oximeter accurately measures oxygen saturation of arterial hemoglobin and pulse rate. This pulse oximeter is easy to use and apply. With the simple press of the button, you will quickly know your blood oxygen saturation (SPO2) and pulse rate (BPM), from any finger. This is a portable, feature rich pulse oximeter that provides spot readings of SpO2 and heart rate for the busy healthcare professional. Comes complete with batteries & instructions