Description
Testo 405i – Hot Wire Anemometer Wireless Smart Probe

- Measures air velocity, volume flow, and temperature
- Measures in-duct air flow and automatically calculates volume flow (enter duct dimensions simply)
- Small dia. (<0.5″) and 15″ telescopic shaft length is ideal for in-duct flow averaging and timed traverse
- Perform air duct leakage tests
- Measurement data is transmitted to the convenient and powerful testo Smart Probes App in your smart device
- Tough, accurate, and easy-to-use
- For all HVAC/R technicians and contractors
The testo 405i Smart Probe hot-wire anemometer 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. Users can read the measurements using the testo Smart Probes 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 Probes 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/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!
Testo Smart Probes: Compact Bluetooth Instruments
The compact and wireless Smart Probes can be operated by a smartphone or tablet via the testo Smart Probes app, which also provides complete reports at the push of a button. These durable multi-function probes are perfect for all aspects of the HVAC field.
The Smart Probes offer you the following
- Comprehensive selection of measuring instruments: smartphone anemometer, iPhone (and Android) hygrometer, smartphone thermometer and lots more
- Practical kits for the most important applications in heating, air conditioning, ventilation and refrigeration
- Operation and documentation entirely via the testo Smart Probes App
Mold detection with Smart Probes

testo 115i
testo 115i – Pipe-Clamp Thermometer Wireless Smart Probe
For monitoring air conditioning and refrigeration systems, and measuring flow and return temperatures.

testo 405i
testo 405i – Hot-Wire Anemometer Wireless Smart Probe
For the measurement of air flow velocities, temperatures, and volume flows in ventilation ducts.

testo 410i
testo 410i – Vane Anemometer Wireless Smart Probe
For the measurement of air flow velocities, temperatures, and volume flows at air outlets.

testo 510i
testo 510i – Differential Pressure Manometer Wireless Smart Probe
For the measurement of differential pressure, air flow velocity, and volume flow.

testo 549i
testo 549i – Refrigeration Pressure Wireless Smart Probe
For service, error detection, and installation of air conditioning and refrigeration systems.

testo 605i
testo 605i – Thermo-Hygrometer Wireless Smart Probe
For the measurement of air temperature and humidity in rooms and ducts.

testo 805i
testo 805i – Infrared Thermometer Wireless Smart Probe
For the non-contact measurement of wall, fuse, and component temperatures in air conditioning systems.

testo 905i
testo 905i – Thermometer Wireless Smart Probe
For the measurement of ambient temperatures and temperatures in ducts and at air outlets.
How do Testo’s smartphone thermometers and smartphone measuring instruments work? With an App!
In simple terms, a Smart Probe is a smartphone measuring instrument. Each of the compact measuring instruments fulfills an entirely specific measuring task in this respect. The testo 410i vane anemometer (smartphone anemometer) for example measures flow velocities. The testo 605i hygrometer (iPhone hygrometer) in turn measures humidity, amongst other things. What is common to them all, is operation via the testo Smart Probes App.
Measuring with an App Has Many Advantages
Measurement using the testo Smart Probes App has many advantages:
Remote Measurement Monitoring
Measurement data transmits to the convenient and powerful testo Smart Probes app, for remote operation and monitoring at up to 50 feet, with a clear line of sight.


Easy Report Generation
Measurement data can be exported directly from the app as a full report, complete with a picture, and saved via email as a PDF, Excel, or JPG file.
Display Multiple Probes
The powerful testo Smart Probes app can connect and display measurements from up to 6 Smart Probes simultaneously.


Trending and Table Display
The app can help you quickly visualize measurement value changes, using the graph or table display mode options.
Special Application Modes
- The AC + Refrigeration section provides automatic evaporation and condensation temperatures, as well as superheat and subcooling measurements.
- The Volume Flow section allows for the configuration of duct parameters for automatic CFM calculations.
- The Cooling and Heating Power section enables automatic BTU calculations.

Environmental Testers / Physical Property/Anemometer / Air Flow Template | |
|---|---|
| Type (anemometer) | Hot-Wire |
| Measurement (anemometer) | Ft/Min |
| Air Velocity Max | 5906 ft/min |
| Air Velocity Min | 0 ft/min |
| Accuracy Air Velocity | ±(19.7 fpm + 5 % of remaining measurement value) (0 to 394 fpm) / ±(0.1 m/s + 5 % of mv) (0 to 2 m/s) ±(59.1 fpm + 5 % of remaining measurement value) (394 to 2953 fpm) / ±(0.3 m/s + 5 % of mv) (2 to 15 m/s) |
| Humidity | No |
| Temperature | Yes |
Product General Attributes | |
| Unique Features | For measuring volume flow, air velocity and temperature Simple configuration of the dimension and geometry of the duct cross-section for determining the volume flow Convenient for working in ventilation ducts thanks to its telescopic tube, which can be extended up to 400 mm |
| Warranty | 2 YEARS |
| Product Height | 30 MM (1.18 IN) |
| Product Length | 200 MM (7.87 IN) |
| Product Width | 41 MM (1.61 IN) |
| HTS/Schedule B Number | 90268020000 |
| ECCN Number | EAR99 |
| Battery Type | AAA |
| Power Supply Voltage | Battery Powered |
| Country of Origin | China |










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