Measuring - TESTO 425 Instruction Manual

6.

Measuring

This chapter describes the steps that are required to
perform measurements with the product.
Taking a measurement:

The instrument is switched on and is in measurement

view.
Put the probe in position.
>
The arrow mark on the probe head must point in the
direction of flow. The correct measurement value
is determined by rotating the probe slightly in both
directions until the maximum value is displayed.
- Read off the readings.
Changing the measurement channel display:

To change between displaying the temperature (°C, °F)
>
and the calculated volumetric flow rate (m
Press .
6. Measuring 27
3
/h, l/s, cfm):