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.

The testo 6651 rises to special challenges. Paired with the testo 660x probe series, it becomes the top choice for demanding air conditioning technology and a wide range of other applications.

Efficiently monitor your compressed air consumption with the testo 6456 compressed air meter. Use it to detect leaks and track usage, allowing for better transparency and cost reduction. It's especially useful for large-diameter pipes (DN65-250).

Monitor your compressed air consumption with precision using the testo 6457 compressed air meter. It helps detect leaks and allocate consumption, providing transparency and reducing costs. Ideal for large-diameter pipes (DN65-250).

Achieve professional-level compressed air consumption measurement with the testo 6448 compressed air meter. It offers precise readings and the convenience of easy bar probe removal.

A portable detector monitoring up to 5 gases, including H₂S, CO, and oxygen depletion, with a compact design and pre-entry check.