prior art an important primary advantage is the reduction and conservation of power consumption in the instruments the gas sensor rf device of the present invention is a passive element that is powered by the reader the reader uses batteries or harvested power so they do not normally require system generated or line power for operation moreover power from the associated reader is utilized on an intermittent basis only during the period that an actual reading is occurring thus power drain on the system is minimal another advantage of the present invention is that standard bourdon type tube gauges are susceptible to the problems associated with moisture and dust and operate effectively in a narrow temperature range these gages can be easily damaged by shock and vibration and lack the accuracy and precision of electronic devises conversely the present invention has no moving parts does not draw power except during the period that the reading is being made and is therefore far more reliable using the present invention a mechanic or technician can accurately determine the status of the remaining oxygen capacity in an oxygen storage system without powering up the system using the wireless embodiment the mechanic can easily make a reading when the gas cylinder is in a location that is not easily accessible because direct access is not required because the system is free of.