Testo 405i Thermal Anemometer


Testo Approved distributor and service company.

Get all measurements from the Testo 405i directly to your phone and download results at the touch of a button.

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0560 1405


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£ 71.10 rrp £ 79.00

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(£ 85.32 inc VAT.)

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The Bluetooth-capable hot-wire anemometer testo 405i, in combination with a smartphone or tablet, is a compact measuring instrument for air flow velocities, temperatures and volume flows. Equipped with a telescopic shaft, extendable to 400 mm, it allows flexible applications in rooms and ducts. Via the App installed on the end device, users can comfortably read off their measurement values, configure volume flow measurements quickly and easily, and reliably determine timed and multi-point mean values.

The measurement protocols can then be directly sent as PDF or Excel files. In combination with the Bluetooth thermal hygrometer testo 605i, the testo 405i is suitable for determining cooling or heating performance.

All measurement data are presented either as a diagram or in tabular form. The measurement data log can then be emailed directly as a PDF or Excel file. In the handy testo Smart Case, the measuring instruments can be conveniently transported and are always to hand when they are needed.


Compact professional measuring instrument from the Testo Smart Probes series, for use with smartphones/tablets.
Measurement of air flow velocity and volume flow.
Measurement data analysis and transmission via Smart Probes App.
Telescopic shaft, extendable up to 400 mm.
Small, compact, and easy to transport.

Testo 405i Specifications:

  • Sensor type: Hot wire.
  • Measuring range: 0 to 30 m/s.
  • Accuracy ±1 digit: ±(0.1 m/s + 5 % of m.v.) (0 to 2 m/s), ±(0.3 m/s + 5 % of m.v.)(2 to 15 m/s).
  • Resolution: 0.01 m/s.
  • Sensor type: NTC.Testo VAC set mobile app
  • Measuring range: -20 to +60 °C.
  • Accuracy ±1 digit: ± 0.5 °C.
  • Resolution: 0.1 °C.
  • Operating temperature: -20 to +50 °C.
  • Battery type: 3 micro batteries AAA.
  • Battery life: 15 hrs.
  • Compatability: requires iOS 8.3 or newer / Android 4.3 or newer.
  • Requires mobile end device with Bluetooth 4.0.
  • Dimensions: 200 x 30 x 41 mm, Telescope extendable to 400 mm.
  • Testo 405i Warranty: 2 years.


Includes: Smart probe Testo 405i, batteries and calibration protocol.

About The Testo Smart Probes App

The App turns your smartphone/tablet into the display of up to 6 Testo Smart Probes at the same time. The operation of the measuring instruments as well as the display of the measurement values take place by Bluetooth via the Testo Smart Probes App on your smartphone or tablet – independently of the measurement location. In addition to this, you can use the App to create measurement reports, add photos and comments to these, and send them by e-mail. The Testo Smart Probes App is completely free and is available for iOS from the App Store and Android via Google Play.

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Testo 405i Thermal Anemometer