This Pulse Oximeter is a great way to go if you are a patient wanting a inexpensive oxygen monitor that works just as well as the ones that cost around $500! Patients can now read their blood oxygen saturation levels, and heart rate without needing to spend a lot of money. With the Gtek-91 Pulse Oximeter offers amazing reliability and durability. This fingertip pulse oximeter is used for spot checks for many different users. Users at home, in sports and recreational use, such as mountain climbing, high-altitude activities and running. These pulse oximeters are not intended to replace a doctor's visit and self diagnostics.