The testo 6631 temperature and humidity transmitter (measuring traffic lights) was specially developed for monitoring critical climates in bio research, such as use in greenhouses or laboratories. The advantages of the testo 6631 temperature and humidity transmitter The testo 6631 temperature and humidity transmitter scores highly when it comes to long-term stability and reliability, with its precise Testo humidity sensor. An integrated ventilator offers targeted flow impact onto the sensor which enables the recording of an averaged climate inside the greenhouse cells. Take advantage of the time the following factors can save you during commissioning and maintenance: Parameterization, adjustment and analysis software (P2A) Fast and easy ventilator replacement thanks to ventilator drawer assembly and plug-in cable Sensor replacement and adjustment possibility using saline pot through easily accessible service opening