TESTO 550i Digital 2-Way Valve ManifoldTESTO 550i Digital 2 Way Valve Manifold 05642550 This TESTO 05642550, TESTO 550i Digital 2 Way Valve Manifold is a quality digital manifold that is equipped with Bluetooth, a 2 way valve block and a sturdy hook, and can be fully controlled via app and smartphone or tablet for flexible, fast measurements and digital documentation. Details: All activities, from measurement through to documentation, using the Testo Smart App on your Smartphone The