Capnocheck II Patient Attachment Kit for used with Hand-held Capnograph or Oximeter. A capnograph is a medical device that measures the concentration of carbon dioxide (CO2) in a patient's exhaled breath. It is commonly used in anesthesia and critical care settings to monitor a patient's respiratory status. An oximeter is a medical device that measures the oxygen saturation of a patient's blood. It typically consists of a sensor that attaches to a patient's finger, earlobe, or toe, and a display that shows the patient's oxygen saturation level. The Patient Attachment Kit includes a gas line, micro-disc filter and 22mm ISO connector that connects to the Capnograph or oximeter.