Met Éireann maintains a national infrastructure of instrumentation for monitoring meteorological and environmental observations and measurements. Many of these are at unmanned locations and are referred to as Automatic Weather Stations (AWS), where the data is processed for inclusion into synoptic code by data loggers. Visibility and present weather observations form part of this remit and specialist sensors are used for the detection, identification and measurement of the relevant parameters. Instruments incorporating some or all of these sensors are referred to as Present Weather Sensors (PWS) and will be referred to “PWS” in this and any associated documentation. As many of these PSWs have reached their anticipated end of service life, Met Éireann is proposing to buy replacement and additional instruments, through this RFT, in addition to procuring ancillaries, spares, training and support.