• Digital hot wire anemometer
• Includes cable connected, telescopic hot wire probe (maximum length 32”)
• Simple, fast and precise flow measurement and volume flow calculation in the ventilation duct
• Fast in-app (duct) configuration, graph history, second screen and measurement data memory in the testo Smart App
• Timed and point mean value calculation
• Telescopic probe makes it easier to work overhead or in large diameter ducts
• Measuring range: 0.01 to 5906 fpm; 0.01 to 30 m/s

Digital Hot Wire Anemometer with App Connection The testo 425 thermal anemometer is your fast, easy and precise companion. The cable-connected telescopic probe can be extended up to 32 in., making it easier to work overhead or in large diameter ducts. All relevant calculations such as volume flow or time and point averages, are performed automatically by the and compact measuring instrument. Configuration of the measuring instrument, display and storage of measured values as well as documentation are available with the testo Smart App. This also turns your smartphone into a second display to give you more flexibility on the job. Testo Smart app • Simple and fast: Measurement menus for numerous applications provide optimum support in configuring and carrying out the measurement • Clear graphical presentation of readings, e.g. as a table, for quick interpretation of results • Create digital measurement reports including photos as PDF/CSV files on site and send via e-mail