This compact, rugged, easy-to-use wireless differential pressure manometer accurately measures static pressure, pressure in manifolds, and pressure drops in buildings or ventilation systems - ideal for the HVAC professional. The manometer can also determine air velocity and volume flow when used with Pitot tube (not included). Includes two hoses (0.15" and 0.2" dia) with adapter. Easily monitor and transmit all measured data wirelessly via Bluetooth to your smartphone or tablet from up to 60 feet away. With the free Testo Smart Probes app, you can display measurements from up to six Smart Probes at the same time, visualize measurement value changes as a graph or a table, and perform automatic calculations. Easily turn your data into a custom report, attach images created with the app, and send via email as a PDF or Excel file. View HVAC measurement on your Smart device from up to 60 feet away! Use the Smart Probes app to read and create custom reports Save and share measurements as a PDF or Excel file Perform difficult calculations automatically Multi-color LED displays low battery warning and Bluetooth connectivity