The flow velocity and flow in ventilation duct to determine, the testo 440 Set an effective measuring device directly to the work to begin!The testo 440 Set contains a compact hand-held meter, a Bluetooth handle and handle adapter, a vane probe (Ã 100 mm) and impeller probe (Ã 16 mm). Both probes are Bluetooth-enabled and have a temperature sensor. The testo 440 hand-held measuring device is supplied with batteries and is ready for use immediately! To Set a suitable combination case included.The meter has a large, illuminated color display and has a structured measurement menu by pressing and specific temporal averaging, average volume flow, current measured value, as well as min/max values are displayed. You can also dimension and geometry of the channel cross-section must be entered to calculate an exact calculation of the volume flow. Other measurement menus as long-term measurement and volume flow measurement with funnel are also possible.The testo 440 meter collects and evaluates your measurement data and may be used up to 7,500 measurement protocols in its integrated measurement data memory. Measurement protocols can be read via a USB-interface and as a CSV file on the computer (e.g. with Excel) can be processed further.In the handheld meter are practical magnets to secure the device to metal surfaces (e.g. flow channel) are integrated. Automatic recognition of the probes, is available.The attached impeller probes can be connected easily with other probe heads or telescopes. Using the button on the handle, the individual measured values. The Bluetooth handle provides for more comfort for your measurement and less cable clutter in the bag!This text is machine translated.