Luchtkwaliteitsmeter WL 1045Lair quality meter with a photoacoustic sensor that displays the ventilation advice based on the CO2 concentration in the air by means of colours. Air quality monitor for indoor air quality monitoring Three color display of the CO2 content Swiss made and patented photoacoustic sensor (PASens) for CO2 detection Color display of ventilation recommendation based on CO2 concentration in the air MIN MAX CO2 memory with programmable duration up to 96 hours