More applications, less equipment: if you already own one of our probes with a universal handle, you can easily expand your portfolio of probes with the 100 mm vane probe head.

More applications, less equipment: if you already own one of our probes with a universal handle, you can easily expand your portfolio of probes with the 16 mm vane probe head.

The extendable telescope with easy-to-read scaling makes it easier to carry out measurements in ventilation ducts. Thanks to the supplied 90&deg; angle, you can even carry out convenient measurements at ceiling outlets. Use the handle adapter to attach the telescope to air velocity probes with a universal handle with Bluetooth<sup>&reg; </sup>or cable.

More applications, less equipment: if you already own one of our probes with a universal handle, you can easily expand your portfolio of probes with the high-precision 100 mm vane probe head.

Ideal for air outlets in cleanrooms: use the high-precision vane probe (with the compatible measuring instrument) to measure even the lowest air velocities and volume flows as well as the temperature. The readings are transmitted directly to your measuring instrument via Bluetooth, making your measurements particularly convenient.

Ideal for air outlets in cleanrooms: use the high-precision vane probe (with the compatible measuring instrument) to measure even the lowest air velocities and volume flows as well as the temperature.

For measurements in ventilation ducts: use the hot wire probe (with the compatible measuring instrument) to measure air velocity, volume flow, air temperature and humidity. The readings are transmitted directly to your measuring instrument via Bluetooth, making your measurements particularly convenient.

For measurements in ventilation ducts: use the hot wire probe (with the compatible measuring instrument) to measure air velocity, volume flow, air temperature and humidity.

More applications, less equipment: if you already own one of our probes with a universal handle, you can easily expand your portfolio of probes with the hot wire probe head.

Use the vane probe to determine air velocity, volume flow and temperature at air outlets, as well as at plate outlets, ventilation grilles or swirl outlets. The readings are transmitted directly to your measuring instrument via Bluetooth, making your measurements particularly convenient.

Use the vane probe to determine air velocity, volume flow and temperature at air outlets, as well as at plate outlets, ventilation grilles or swirl outlets.

For measurements in ventilation ducts: use the vane probe (with the compatible measuring instrument) to measure air velocity, volume flow and air temperature. The readings are transmitted directly to your measuring instrument via Bluetooth, making your measurements particularly convenient.

For measurements in ventilation ducts: use the vane probe (with the compatible measuring instrument) to measure air velocity, volume flow and air temperature.

<div style="background-color: #f4f3f1;border: 1px solid #e8e6e3;border-top-left-radius: 16px;border-top-right-radius: 16px;padding: 1rem;margin: 0 -1rem 1.5rem;"><b>When you register your product, we will extend the regular manufacturer's warranty by one year. <a href="https://www.testo.com/en-US/services/product-registration-climate">&gt;&gt; Register now and get a warranty extension.</a></b></div>Ideal for Testing, Adjusting and Balancing (TAB) / (Retro)-Commissioning &ndash; Professionals (BSC / RCx) or Cleanroom Performance Tester (CPT) the testo 400 Air Flow kit meets highest standards when it comes down to accuracy and durability for air velocity measurements on HVAC systems.
<h3>&nbsp;</h3>

<div style="background-color: #f4f3f1;border: 1px solid #e8e6e3;border-top-left-radius: 16px;border-top-right-radius: 16px;padding: 1rem;margin: 0 -1rem 1.5rem;"><b>When you register your product, we will extend the regular manufacturer's warranty by one year. <a href="https://www.testo.com/en-US/services/product-registration-climate">&gt;&gt; Register now and get a warranty extension.</a></b></div>This testo 440 kit is great for carrying out measurements at air outlets. The testo&nbsp;440 air velocity and IAQ measuring instrument and its vane probe (&Oslash; 3.9&quot;) with temperature sensor can all be safely stored in the included case.

<div style="background-color: #f4f3f1;border: 1px solid #e8e6e3;border-top-left-radius: 16px;border-top-right-radius: 16px;padding: 1rem;margin: 0 -1rem 1.5rem;"><b>When you register your product, we will extend the regular manufacturer's warranty by one year. <a href="https://www.testo.com/en-US/services/product-registration-climate">&gt;&gt; Register now and get a warranty extension.</a></b></div>This testo 440 kit is great for carrying out measurements in ventilation ducts and at air outlets. The testo&nbsp;440 air velocity and IAQ measuring instrument, its vane probe (&Oslash;&nbsp;3.9&quot;) with Bluetooth and temperature sensor, and hot wire probe including temperature sensor&nbsp;can all be safely stored in the included case.

<div style="background-color: #f4f3f1;border: 1px solid #e8e6e3;border-top-left-radius: 16px;border-top-right-radius: 16px;padding: 1rem;margin: 0 -1rem 1.5rem;"><b>When you register your product, we will extend the regular manufacturer's warranty by one year. <a href="https://www.testo.com/en-US/services/product-registration-climate">&gt;&gt; Register now and get a warranty extension.</a></b></div>This testo 440 kit is great for carrying out measurements in ventilation ducts and at air outlets. The testo&nbsp;440 air velocity and IAQ measuring instrument and its vane probes can all be safely stored in the included case.

<div style="background-color: #f4f3f1;border: 1px solid #e8e6e3;border-top-left-radius: 16px;border-top-right-radius: 16px;padding: 1rem;margin: 0 -1rem 1.5rem;"><b>When you register your product, we will extend the regular manufacturer's warranty by one year. <a href="https://www.testo.com/en-US/services/product-registration-climate">&gt;&gt; Register now and get a warranty extension.</a></b></div>Carry out measurements without any annoying cables: use the kit to handle all relevant measurements in ventilation ducts and at air/ceiling outlets. You will receive the testo 440 dP air velocity and IAQ measuring instrument including differential pressure sensor and the 100 mm vane probe head and hot wire probe head (&Oslash; 9 mm) for attachment to the universal Bluetooth handle supplied.&nbsp; To make measurements more convenient, both probe heads can be combined with the telescope included in the kit. The equipment can be transported safely and conveniently in the robust case.

<div style="background-color: #f4f3f1;border: 1px solid #e8e6e3;border-top-left-radius: 16px;border-top-right-radius: 16px;padding: 1rem;margin: 0 -1rem 1.5rem;"><b>When you register your product, we will extend the regular manufacturer's warranty by one year. <a href="https://www.testo.com/en-US/services/product-registration-climate">&gt;&gt; Register now and get a warranty extension.</a></b></div>Carry out measurements without any annoying cables: use the kit to handle all relevant measurements in ventilation ducts and at air/ceiling outlets. You will receive the testo 440 dP air velocity and IAQ measuring instrument including differential pressure sensor, two vane probe heads (&Oslash; 100 mm and &Oslash; 16 mm) and a humidity/temperature probe head &ndash; all three can be attached to the universal Bluetooth&lt;sup&gt;&amp;reg;&lt;/sup&gt; handle supplied. To make measurements more convenient, both vane probe heads can be combined with the telescope included in the kit. The equipment can be transported safely and conveniently in the robust case.

Use the telescope extension to easily extend the telescope for&nbsp;air velocity probes with universal handle &ndash; attain a total probe length of up to 2 m.

Storage temperature	-4° to 140 °F / -20 to +60 °C
Weight	2.8 oz. / 80 g
Dimensions	18.7 x 0.6 x 0.6 in. (per rod) / 475 x 16 x 16 mm (per rod)
Operating temperature	23° to 122 °F / -5 to +50 °C
Diameter telescope	0.472 in. / 12 mm
Product colour	Black

Telescope extension (length 0.4 to 0.9 m) for flow probes

Telescope extension (length 0.4 to 0.9 m) for flow probes

General technical data