testo 425 Thermal Anemometer | 0.01–30 m/s, resolution 0.01 m/s, telescopic probe up to 820 mm, app connectivity
TESTO425
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testo 425 Thermal Anemometer | 0.01–30 m/s, resolution 0.01 m/s, telescopic probe up to 820 mm, app connectivity

testo 425 Thermal Anemometer: Telescopic Probe, App Connectivity Overview The testo 425 thermal anemometer measures air velocity and volume flow in HVAC ducts. The telescopic probe is connected by a 1.5 m cable and extends to 820 mm for reaching into ducts. The testo Smart App is used to set duct dimensions, view history curves, act as a second scr

Air velocity 0.01–30 m/s; ±(0.03 m/s + 4% of reading) at 0.01–20 m/sTemperature −20 to 70 °C ±0.5 °C; volume flow calculation, timed and multi-point averagingTelescopic probe up to 820 mm (1.5 m cable); 3 × AA approx. 35 h; 268 g
Corporate reference price (excl. tax)
Price on request
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One-year manufacturer warranty
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Overview

testo 425 Thermal Anemometer: Telescopic Probe, App Connectivity

Overview

The testo 425 thermal anemometer measures air velocity and volume flow in HVAC ducts. The telescopic probe is connected by a 1.5 m cable and extends to 820 mm for reaching into ducts. The testo Smart App is used to set duct dimensions, view history curves, act as a second screen and record data, with timed and multi-point averaging.

Key Specifications

  • Air velocity: 0.01–30 m/s; 0.01–20 m/s: ±(0.03 m/s + 4% of reading); 20.01–30 m/s: ±(0.5 m/s + 5% of reading); resolution 0.01 m/s
  • Temperature: −20 to 70 °C, ±0.5 °C
  • Probe: Telescopic probe up to 820 mm, shaft diameter 7.5 mm, cable length 1.5 m
  • Power and protection: 3 × AA, approx. 35 h; IP20
  • Dimensions and weight: 135 × 60 × 28 mm, 268 g

Applications

  • Duct air velocity and volume flow measurement, and outlet checks.

Specifications per the testo international (English) product page for the testo 425 with app connectivity (0563 0425) (retrieved 2026-10-21).

Specifications

Key specifications
Air velocity 0.01–30 m/s; ±(0.03 m/s + 4% of reading) at 0.01–20 m/sTemperature −20 to 70 °C ±0.5 °C; volume flow calculation, timed and multi-point averagingTelescopic probe up to 820 mm (1.5 m cable); 3 × AA approx. 35 h; 268 g
Model
425
Brand
TESTO
Purchasing
In stock, tax incl. / B2B formal quotation request (RFQ)
Warranty
One-year manufacturer warranty

Calibration

If your instrument needs periodic calibration, register the brand, model and calibration requirements on the calibration service page and we will send a separate quote.

Go to calibration service