Greisinger gox100t precision air oxygen measuring device for diving applications greisinger gox 100 p the greisinger gox 100t is a precision air oxygen measuring device for diving applications p p this device measures the oxygen concentration in gas mixtures and air the actual measurement takes place at the opening of the sensor due to the design of the sensor the device has to be calibrated at regular intervals at fresh air 20 95 oxygen to get accurate measuring values p grei