Testo 425 thermal anemometer

The Testo 425 thermal air velocity meter covers the air velocity range from 0.01 to 30 m/s and the temperature range from - 20 to 70 °C. The compact 425 uses a heated wire NTC sensor on a hand held telescopic probe to measure velocity and temperature for applications in the HVAC industry.

Features

• Multi-point averaging
• Time averaging
• Optional Bluetooth printer available
• Parallel temperature measurement
• Velocity and temperature values at a glance
• Volume flow capability
• Connection to smart devices via the Testo App
• Max/min values
• Backlight
• Auto Off function

The 417 can also be used with the free to download Testo Smart App that turns your smart phone or tablet into a second display.  This easy to use software has menus for numerous applications, and you can create digital reports with photos that can be e-mailed. 

Technical

Measuring ranges     0.1 to 30 m/s, - 20 to 70 °C

Accuracies      ±(0.03 m/s + 4.0 % of mv) (0.01 to +20 m/s), ±(0.5 m/s + 5.0 % of mv) (20.01 to +30 m/s), 0 to 60 °C; ± (0.5 °C)

Resolutions      0.01 m/s, 0.1 °C

Operating temperature       - 20 to + 70 °C

Probe head      7 mm diameter x 820 mm maximum length

Cable length       1.5 m

Battery      3 x AA batteries

Battery life      35 hours typical

Weight      268 g

Dimensions      135 mm x 60 mm x 28 mm

Materials   ABS + PC / TPE