Ingen Technologies Oxyview® In-line Oxygen Flow Meter with Smart Nasal Cannula, 0 to 6L/min. Flow Rate, No Batteries The Ingen Oxyview® Nasal Cannula with Pneumatic Oxygen Flow Meter is a unique adult oxygen cannula with an oxygen flow sensor built-in used to visibly monitor the actual amount of prescribed oxygen that is produced from the cylinder or concentrator. The Oxyview® Smart Nasal Cannula simply connects to any oxygen source and immediately measures the oxygen flow rate that is given off from the device. The Oxyview® nasal cannula makes oxygen monitoring easy. Not only does it replace costly monitoring devices, but it is also a great visibility tool for healthcare professionals. FDA registered, this nasal cannula fits all respiratory devices and requires no batteries for use. Use a cannula that will make life easier with Ingen's Oxyview® nasal cannula.