• Includes NIST traceable calibration certificate
• Patented flow straighteners greatly improve accuracy and stability of measurements at turbulent outlets
• Weighs less than 6.4 lbs. (2.9 kg.)
• Detachable 420 Multi-function flow instrument that can be used with the 420 flow hood, pitot tubes, or flow matrix
• Quick, easy remote monitoring and reporting with Bluetooth and free App
• Data logging using on-board 2 GB memory
• Logged data can be transferred to PC using mini-USB cable

Testo 420 KIT is an airflow capture hood with NIST traceable calibration. The 420 flow hood system is a lightweight, accurate and convenient solution for balancing volume flow at registers and returns. At turbulent outlets, the patented flow straighteners significantly improve measurement accuracy & stability, save time and eliminate the uncertainty of measuring turbulent outlet ducts. Positioning is especially easy with its ergonomic handles, and low weight of less than 6.4 lbs. The optional tripod stand provides convenient handling when testing in large buildings, or at greater heights. The testo 420 flow hood has a wide variety of optional interchangeable flow skirts in different sizes and configurations. The lightweight testo 420 is easy to setup and disassemble and comes in a convenient rolling case. Exceptionally Light The testo 420 air flow capture hood with ergonomic handles and tiltable display has an exceptional light weight of less than 6.4 lbs. This means that frequent volume flow calculations in large rooms and measurements above head height can be carried out reliably and comfortably. While in use, a large measuring button on the capture hood ensures easy recording of the measurements. Removable Control Unit The control unit of the testo 420 enables you to measure flow velocity, volume flow, absolute pressure, temperature, and relative humidity. The automatic zeroing ensures higher accuracy for low pressures. This integrated measuring control unit was not just developed for volume flow measurement at ceiling outlets, as it can be removed from the capture hood and be used for pressure, flow, and volume flow measurements in the duct. You only need to attach a pitot tube and connection hoses (both optional) for measurements in ducts. Timed and multi-point mean calculation, as well as the combination of the two, together with simple input of the duct geometry, provide you with accurate flow measurements in ducts. This means you can save on the purchase of an additional measuring instrument. Testo 420 App The testo 420 app enables live measurement streaming of HVAC systems using a smartphone or tablet. The app features a start and stop function and enables you to save your measurement data in .txt format, and creates the measurement protocol directly on site. Measurement results, such as the overall volume flow and the air exchange rate, can be directly assigned to customer-specific folder templates. You can then send your readings and protocols via the in-app email function, saving you a considerable amount of time and increasing efficiency.