Identify vacuum quickly and easily by means of the graphical display in the App or on the digital manifold screen Connects automatically via Bluetooth® to the testo Smart App and digital manifolds Exceptionally compact and reliable thanks to the robust, easy-to-handle housing with IP 54 protection class Easy installation at any service port thanks to the integrated 45° angle The testo 552i wireless vacuum probe allows simple measurement of system evacuation via a single service port. The testo 552i automatically connects to the testo 550s and 557s digitam manifolds and can also be used in conjunction with the 550i via the smart app.