The Testo 635-1 is a highly accurate temperature and humidity measuring instrument designed for professional use in various environments. It features precise measurement capabilities for both temperature and relative humidity, with a broad range of applications in industries such as HVAC, agriculture, industrial process control, museums, and storage facilities. This instrument allows for flexible measurements, as it supports the connection of external probes for specific needs, offering a high degree of versatility.

The Testo 635-1 provides fast and reliable readings with excellent accuracy, making it ideal for monitoring and controlling indoor climates, preventing equipment damage due to humidity, and ensuring proper storage conditions. The large, easy-to-read display and intuitive controls make it simple to operate, while the robust, portable design ensures it can withstand demanding field conditions. Whether used for building diagnostics, quality control, or research, the Testo 635-1 offers a dependable solution for efficient environmental monitoring and analysis.