testo 405i - Hot-wire anemometer wireless Smart Probe

Order-Nr.  0560 1405

  • Measures air velocity, volume flow, and temperature

  • Measures in-duct air flow, and automatically calculates volume flow (simply enter the duct dimensions)

  • Small diameter (<0.5”) and 15” telescopic shaft length is ideal for in-duct flow averaging and timed traverse

  • Live data feed integration now available with the MeasureQuick App

The testo 405i Smart Probe is a wireless instrument for measuring air flow velocity, temperature, and volume flow.  It is equipped with a telescopic shaft, which extends to 15” for easy in-duct testing. You can reliably determine timed and multipoint flow traverses.


Product Description

Users can read the measurements using the testo Smart app installed on their smart device.  The app lets users configure duct dimensions to calculate volume flow measurements.  Use the testo 405i along with the testo 605i thermo-hygrometer to determine cooling and heating performance.  The testo 405i works on smart devices with either Android or Apple operating systems.

The testo Smart app is a powerful and easy to use tool.  It allows you to remotely read measurements from up to six (6) Smart Probes, and easily document and report the results.  Automatic calculations make it a snap!

All measurement data is displayed as instrument readings, tables, or graphs.  The measurements can be quickly saved as PDF or Excel files.  The app creates custom reports, which can be saved and/or shared by email.  All your data can be stored and retrieved, saving you hours of time consuming paperwork!

Delivery Scope

testo 405i Bluetooth hot-wire anemometer, including 3 AAA batteries and certificate of conformity

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Technical Data

Temperature - NTC

Measuring range

-4° to 140 °F / -20 to +60 °C


±0.9 °F / ±0.5 °C


0.1 °F / 0.1 °C

Velocity - Hot wire anemometer

Measuring range

0 to 5906 fpm / 0 to 30 m/s


±(19.7 fpm + 5 % of mv) (0 to 394 fpm) / ±(0.1 m/s + 5 % of mv) (0 to 2 m/s)

±(59.1 fpm + 5 % of mv) (394 to 2953 fpm) / ±(0.3 m/s + 5 % of mv) (2 to 15 m/s)


1.97 fpm / 0.01 m/s

General technical data


4.22 oz. / 119.6 g


8 x 1 x 2 in. / 200 x 30 x 41 mm

Operating temperature

-4° to 122 °F / -20 to +50 °C



System requirements

requires iOS 13.0 or newer; requires Android 8.0 or newer; requires mobile end device with Bluetooth 4.2

Product colour


Battery life

15 h

Battery type

3 x AAA

Diameter probe shaft

0.472 in. / 12 mm

Diameter probe shaft tip

0.354 in. / 9 mm

Length probe shaft

15.748 in. / 400 mm

Storage temperature

-4° to 140 °F / -20 to +60 °C



$ 45.00
excl. tax