TESTO 425 - Measuring

7 Using the product
14
2
Press ◄ / ► to set the required unit for the top line (m/s, fpm) and
confirm with MENU/ENTER.
3
Press ◄ / ► to set the required unit for the bottom line (m
3
/h, l/s, cfm)
and confirm with MENU/ENTER.
7.1.4
Setting the area

Configuration mode is open, “AREA” is displayed.
1
Press ◄ / ► to select whether the cross-sectional area is to be
entered in m² or in mm² and confirm with MENU/ENTER.
2
Press ◄ / ► to set the cross-sectional area and confirm with
MENU/ENTER.
The measuring instrument can show a maximum of 5 digits in the
display (99999 mm²). Conversions from m² to mm² with a value greater
than 0.09 m² are therefore not possible!
7.1.5
Reading absolute pressure
Thanks to a built-in absolute pressure sensor (measurements are taken on the
measuring instrument, not on the probe head), no additional input of the air
density is required.

Configuration mode is open.
1
Press ◄ / ► to scroll through the configuration menus until “P_ABS”
(absolute pressure) is displayed.

The current ambient air pressure is displayed.
7.1.6
Carrying out a reset of the setting menus

Configuration mode is open, “M. RES” (menu reset) is displayed.
1
Press ◄ / ► to select the required option and confirm with
MENU/ENTER:
o NO: Do not carry out reset.
o YES: Carry out reset. All concealed menus that were hidden
via the testo Smart App are displayed again.

The instrument returns to measurement view.
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