Sentri™ Intersurgical EcoLite™, adult, mask with CO2 monitoring line, filter and tube, 2.1m Sentri™ is available as an adult mask and in three sizes of nasal cannula. Both permit the sampling of exhaled carbon dioxide in non-intubated patients during the administration of supplementary oxygen. The Sentri™ Intersurgical EcoLite™ mask is an adult, medium concentration oxygen mask with a luer lock connector enabling the connection of a monitoring line, the other end of which is connected to a capnometer. The Sentri mask is used for measuring end-tidal CO2 (ETCO2) in expired gases while supplying oxygen to the patient