• 100mm (4 inch) vane probe head
• Used to determine air velocity, volume flow and air temperature
• Bluetooth connection between measuring instrument and probe
• Practical button on the handle for storing individual readings, convenient measurement at ceiling outlets with optional telescope (up to 1 m)
• Must be used along with a compatible Testo multifunction instrument

Testo 0635 9431 20 is a 100mm (4 inch) vane probe head. The 0635 9431 20 includes a Bluetooth handle for wireless connection to your measuring device. Please note, this probe cannot be used on its own - it must be used with a Testo multifunction instrument, and can be used to determine air velocity, volume flow and air temperature. Vane probe with Bluetooth including temperature sensor The readings of the vane probe are transmitted to your measuring instrument via Bluetooth, up to a distance of 20 m. The clearly structured measurement menu for volume flow enables the measuring instrument to be operated intuitively. The volume flow is precisely calculated thanks to convenient input of the size and geometry of the duct cross-section. Timed and multi-point mean calculation, average volume flow, current reading and min./max. values are displayed in the measuring instrument. Particularly useful: press the button on the vane probe to operate the measuring instrument. For example, to store individual readings for multi-point mean calculation or to start and stop measurement series for mean calculation over time. Wireless and space-saving: more applications, less equipment Endlessly versatile: a universal handle can be connected to all probe heads - so you can master more applications using less equipment and save space. The Bluetooth handle makes it more convenient to carry out your measurement and guarantees less cable clutter in the case. Or order the cable handle to connect testo probe heads. This is an advantage if Bluetooth signals are not permitted. If the vane needs to be replaced in the distant future, you can change the probe head. If required, you can also fit the vane probe with the extendable telescope with 90° angle and, if necessary, the telescope extension (both can be ordered separately; in combination 2 m long). This makes it easy to measure at ceiling outlets. Intelligent calibration concept You will get exceptionally accurate measurement results with the digital vane probe, because the measuring instrument makes measurement uncertainty a thing of the past. You only need to send the probe head in for calibration - so the measuring instrument remains in continuous use.