Measure without annoying cables: With this set, you can perform all relevant measurements in the ventilation duct and at the air or ceiling outlet. You will receive the testo 440 dP climate measuring device, including a differential pressure sensor, as well as a 100 mm vane probe head and a hot wire probe head (Ø 9 mm) that can be attached to the included universal Bluetooth handle. For more comfortable measurements, both probe heads can be combined with the telescope included in the set. The robust case allows for convenient and secure transport of the equipment.