Testo 635-1 temperature and humidity measuring instrument, or potentially a similar model like the Testo 635-2, which is designed for environmental monitoring.
Here's information about the Testo 635-1 for shopping:
Functionality:
It measures temperature, air humidity, and dew point, and can calculate the dew point distance between indoor air and wall surfaces, which is useful for mould prevention.
Probe Options:
It can be used with optional probes for measuring air humidity, temperature, absolute pressure, and material equilibrium moisture content.
Applications:
It's suitable for checking air humidity and temperature in living areas, compressed air systems, and for assessing moisture in building materials like ceilings and walls.
Ease of Use:
The instrument and its menu guide are designed for simple and comfortable operation, featuring a backlit display for visibility in poor lighting conditions.