All results at a glance thanks to the large graphic display Exceptionally compact and reliable thanks to the easy-to-handle, robust housing with IP 54 protection class Simple, wireless measurement of vacuum and temperature via automatic Bluetooth® Even greater flexibility for your measurements and documentation with the testo Smart App The testo 550s digital manifold with Bluetooth and a 2-way valve block features a large graphic display, a compact, robust housing, guided measurement menus and the testo Smart App. Top-quality measurement technology, a high degree of reliability and smart functions for quick, easy measurements and documentation make the testo 550s manifold a reliable partner for your commissioning, servicing and maintenance of refrigeration and air conditioning systems and heat pumps.