testo 425

www.testo.com

Data sheet

Measurement of flow velocity, volume flow and temperature

Point and timed mean value calculation

Max./min. values

Hold button for freezing measurement value

Display illumination

Auto-off function

TopSafe, protection of the instrument from dirt and impact

(optional)

Thermal

anemometer

testo 425 – With fixed flow velocity

probe

m/s

°C

testo 425 is a compact anamometer with a fixed thermal

flow velocity probe. The probe head has a diameter of

7.5 mm. With the extendable telescope (length max. 820

mm), the measuring instrument is suitable for flow velocity

measurement in ducts. The testo 425 also measures

extremely accurately in the low flow velocity range.

The volume flow is directly shown in the display. For the

purposes of volume flow calculation, the duct area can be

easily entered into the testo 425. In addition to this, the

instrument can be switched over to display the current

temperature. Timed and point mean value calculation

provide information on the average volume flow, flow

velocity and temperature measurement value. The Hold

function allows the current measurement value to be frozen

in the display, min./max. values are also displayed at the

press of a button.