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Testo 425 Compact Thermal Anemometer

Testo
SKU: TESTO425
  • Measure air flow velocity and air temperature
  • Calculate volume flow by entering duct channel area
  • Extendable telescopic probe with 820mm maximum extension
More Info
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Testo 425 Compact Thermal Anemometer

The Testo 425 Compact Thermal Anemometer is an extremely useful instrument for use in the HVAC sector, particularly ascertaining air flow and temperature readings in ventilation ducts. This is because of the compact ø7.5mm diameter sensor that sits on top of a telescopic probe with a maximum length of 820mm. The use of a hot-wire probe rather than a vane also means that it is easier to position the meter at an appropriate angle. The anemometer had an air flow velocity range of 0 to 30m/s and a temperature range of -20˚C to 70˚C whilst volume flow can also be calculated if the user enters the cross-sectional area of the duct.

The large, backlit, digital screen on the Testo 425 shows results for air flow, volume flow and temperature in m/s, m3/h and ˚C. It is capable of showing two readings simultaneously and also offers min/max values alongside data hold. Further measurement options include point and timed mean value calculation. The anemometer has a 35-hour battery life and is also provided with batteries and a calibration protocol certificate. The Testo 425 has a robust and durable design, with a protection class rating of IP40 for thew instrument and IP20 for the probe.

Testo part number:0563 0425

Testo Smart App Compatible

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Download today and make every measurement count (available on Android & iOS).

The app is FREE to download and includes lifetime extensions and updates.

Key Features

  • Air flow velocity range: 0 to 30m/s
  • Air flow velocity accuracy: ±(0.03 m/s + 4% of m.v.) (0 to 20 m/s) ±(0.5 m/s + 5% of m.v.) (20.01 to 30 m/s)
  • Air flow velocity resolution: 0.01m/s
  • Temperature range: -20˚C to 70˚C
  • Temperature accuracy: ±0.5˚C
  • Temperature resolution: 0.1˚C
  • Volume flow calculation
  • 820mm telescopic probe
  • Point and timed mean values

What's In The Box?

  • Testo 425
  • Fixed telescope (max 820mm)
  • 3 X AA batteries
  • Transport bag
  • Calibration protocol
Specification

Temperature - NTC

  • Measuring range: -20 to +70 °C/ Probe -20ºC to 70ºC
  • Accuracy: ±0.5 °C (0 to +60 °C); ±0.7 °C (Remaining Range)
  • Resolution: 0.1 °C

Velocity - Thermal anemometer

  • Measuring range: 0 to +20 m/s
  • Accuracy: ±(0.03 m/s + 5 % of mv)
  • Resolution: 0.01 m/s

General technical data

  • Dimensions: 135 x 60 x 28mm probe length 180mm, Ø 7.5 mm cable length 1.5m
  • Storage temperature: -20 to +50 °C
  • Operating temperature: -20 to +50 °C
  • Housing material: ABS + PC/TPE
  • Protection class: Measuring instrument IP40/Probe IP20
  • Battery type: 3 x AA batteries
  • Battery life: 35 hours
  • Weight: 268g
Label Type Size Download
pdf Testo 425 Datasheet pdf 603.3 KB Download
pdf Testo Compact Class Brochure - Jan 2023 pdf 3 MB Download