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Testo 425 – Digital Hot Wire Anemometer With App Connection.


7 in stock

  • Simple, fast and precise flow and temperature measurement plus volume flow calculation in the ventilation duct
  • More flexibility for duct measurements with the cable-connected telescopic probe (maximum length 820 mm)
  • Fast in-app (duct) configuration, graph history, second screen and measurement data memory in the testo Smart App
  • Timed and point mean value calculation

46,499.00  66,990.00 

7 in stock


Product Description

Modern buildings must have air conditioning and ventilation systems that are properly calibrated. In order to verify that the flow, temperature, and volume flow in the ventilation duct are accurate, it is crucial to utilise the right measurement technology. The testo 425 thermal anemometer is your quick, simple, and accurate ally. Working overhead or in ducts with a big diameter is made easier thanks to the cable-connected telescopic probe’s ability to be extended up to 820 mm. The extremely durable and small measurement equipment automatically performs all pertinent calculations, such as volume flow or time and point averages. In addition, the testo Smart App makes it incredibly easy to configure the measuring device, display and store measured information, and create documentation.Your smartphone now serves as a second display as a result.

Technical data

Temperature - NTC

Measuring range

-20 to +70 °C


±0.5 °C


0.1 °C

Velocity -Thermal anemometer

Measuring range

0.01 to 30 m/s


±(0.5 m/s + 5.0 % of mv) (20.01 to +30 m/s)
±(0.03 m/s + 4.0 % of mv) (0.01 to +20 m/s)


0.01 m/s

General technical data


268 g


135 x 60 x 28 mm

Operating temperature

Probe: -20 to +70 °C
-20 to +50 °C

Product-/housing material


Cable length

1.5 m

Diameter probe shaft

7.5 mm

Protection class


Length probe

180 mm

Battery life

35 h

Battery type

3x AA

Storage temperature

-20 to +50 °C


Datasheet : Testo 425 – Digital Hot Wire Anemometer.

Instruction Manual : Testo 425 – Digital Hot Wire Anemometer.

Delivery Scope

  • Testo 425 – Thermal hot wire anemometer with App connection and fixed telescope (max. 820 mm).
  • Transport bag.
  • Calibration protocol.
  • 3 x AA batteries.