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Measures relative humidity and temperature, and calculates dew/frost point for HVAC applications, with a focus on reliability and repeatability. Ideal for use in offices and other indoor environments.

The testo 6621 high-performance measurement transmitter is a dependable solution for building air conditioning applications. Offering excellent accuracy, long-term stability, and reliability, this transmitter meets the rigorous standards of building automation, helping to optimize efficiency and reduce costs.

The testo 6631 temperature and humidity transmitter is specifically designed for use in greenhouses and laboratories, providing reliable monitoring of critical environmental conditions essential for biological research.

Measures relative humidity and temperature, and calculates dew/frost point for HVAC applications, with a focus on reliability and repeatability. Ideal for use in offices and other indoor environments.