This compact Greisinger GOX 100 T Oxygen Meter with Sensor measures the oxygen concentration in gas mixtures & air. For the best the results the actual measurement of the oxygen takes place at the tip of the included sensor. The unique design of the sensor the device has to be calibrated at regular intervals to obtain accurate measuring values. When the sensor is used up, the device will detect this at calibration & the sensor element hast to be replaced before the start of the next measurement. By means of the integrated hold-function, the MOD-Display (max. operating depth) & a specialized sensor, it is optimized for the testing of diving gas mixtures (such as NITROX). Features. Min, max value storage. Cheap sensor element very easy to replace. Sensor evaluation for assessment of the sensor status. Simplest calibration on air. Configurable automatic OFF function. MOD-display (indicates the maximum permitted depth with the measured oxygen mixture).