pressure transmitters; pressure indicators; electronic apparatus for monitoring the pressure and flow of gases; electronic monitoring apparatus, other than for medical purposes; pressure measuring instruments; detecting apparatus and instruments; measuring apparatus, devices and instruments; radio apparatus; instruments for measuring pressure; wireless communication devices; pressure indicating plugs for valves; apparatus for the transmission and communication of data; communications apparatus; wireless signal transmitters; wireless transmitters; vibration sensors; pressure sensors; sensors for determining temperature; movement sensors; motion sensors; sensors for real time data output apparatus; sensors for real time data input apparatus; sensors, detectors and monitoring instruments; sensors for Internet of Things [IoT] enabled devices; oxygen sensors, other than for medical use; data transmitting apparatus; digital sensors; electric or electronic sensors; electronic detectors; electrical couplings; gas flow monitors