Many production, treatment and processing processes often require real-time data and information to be available locally, in order to directly evaluate the compressed air quality and implement corrective action when necessary. The display for the indications is therefore built in between the transducer and the data cable. The METPOINT UD01 and UD02 plug-on displays indicate measurement data such as e.g. pressure or dew point directly on the transducer, exactly at the point where they occur.