The Quick-Ox offers fast accurate measurement with minimum loss of gas and minimum skill. A by product of this system is the gas flows across the sensor. This prevents high pressures, which can damage the membrane of the sensor.and not directly onto the sensor face as in existing Dome sensing system. This device can be used by any level of diver and is not dependent on skill to achieve accuracy. Calibration is easy and fast by removing the flow divertor and waving in fresh air. (R-17 Sensor Not Included)