Greisinger gox 100 t compact oxygen meter with sensor greisinger gox 100 t the greisinger gox 100 t is a compact oxygen meter with sensor that measures the oxygen concentration in gas mixtures and air the actual measurement takes place at the opening of the sensordue to the design of the sensor the device has to be calibrated at regular intervals at fresh air 2095 oxygen to get accurate measuring values if the sensor is used up this will be detected at calibration and the sensor ele