Capnography, a type of monitoring commonly used in hospital operating rooms and Intensive Care Units, measures concentrations of inhaled and exhaled carbon dioxide (CO2) going in and out of a patient's lungs. Also known as EtCO2 monitoring, Nonin - a world leader in medical monitoring - manufactures two of the most frequently used capnography equipment: LifeSense&Reg; and RespSense®. These monitors, commonly used in sleep labs, during emergency transport (EMS) and in hospitals, clinics and home care settings, are hooked up to the patient through a straight t-connector and a CO2 tubing sample line like those featured here. These are medical disposables and come packaged with 25 per box. They're capable of delivering the proper amount of oxygen to the patient while monitoring the amount of CO2 being passed. These CO2 connectors work on either intubated or non-intubated patients.