alcohol sensor 11 to a pre determined temperature the non volatile memory unit 15 stores calibration data and the adapter 30 communicates data and readings to the breathalyzer 100 returning to fig2 signals from the sensor module 60 to the breathalyzer 39 s processor or signal processing unit 150 shown in fig1 through a pin 3 and the calibration data from the non volatile memory 15 is sent through pins 4 and 5 as shown in fig4 the cable 40 connects the breathalyzer 100 to the adapter 30 of the sensor module 21 in accordance with an exemplary embodiment of the present invention the sensor module 60 comprising the breath sampling tube 20 includes all components of a breathalyzer 100 that may suffer from residue build up and other problems requiring re calibration this advantageously enables the present invention to provide a breathalyzer 100 that is as accurate as and functionally equivalent to a u201c new u201d breathalyzer 100 by simply replacing the sensor module 60 of the present invention the non volatile memory 15 includes various other pins such as pin 7 labeled as u201c w p u201d which means u201c write protect u201d to prevent the non volatile memory 15 from losing the calibration data the primary.