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A Touch Of Genius.
The new digital manifold testo 558s with intuitive app feel.
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Video: The Testo probe system

Video: The Testo probe system

Flexible and saves space:

The testo 440 Bluetooth or cable handle can be universally combined with all probe heads and attachments in the testo 440 probe system. So you need less equipment, and it will take you a matter of seconds to switch from measuring the comfort level to determining the volume flow in ducts.

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