332 the pressure sensor 316 can be electrically connected to the bridge amplifier 324 or similar device which is electrically connected to the controller 310 and the display processor 326 by the electrical bus 330 in an alternative embodiment the pressure sensor is self contained with appropriate sensor amplifier and analog to digital converter all packaged in a device that can be attached to a printed circuit board this attachment may use wave soldering techniques hand soldered inserted etc the display processor 326 is electrically connected to the visual display 320 by the electrical bus 330 the audio output system 322 can be electrically connected to the controller 310 or the bridge amplifier by the electrical bus 330 fig4 a illustrates a flow chart of an exemplary encoding scheme for pressure measurement wherein the number of samples taken within a sampling interval is randomly generated the encoding scheme illustrated in fig4 a can be hard wired or it can be generated using software either embedded or provided from an external input the encoding scheme comprises defining a sampling time window 402 generating a random number of samples 404 within the sampling window 402 taking the samples 408 in accordance with the sampling rate generated in step 404 closing 410 the time window and then simultaneously displaying 412 the output on a visual output device or sending 412 the data to a controller and returning from.