Operation; Connecting A Probe; Switching The Instrument On / Off; Switching The Display Light On / Off - TESTO 425 Instruction Manual

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5. Operation

5. Operation
This chapter describes the steps that have to be executed
frequently when using the product.

5.1 Connecting a probe

The necessary probes are permanently connected or
integrated. It is not possible to connect any additional
probes.
5.2 Switching the instrument
on / off
Switching the instrument on:

Press
>
- The thermal sensor is heated up (5s).
- Measurement view is opened: The current reading
is displayed, or ----- lights up if no reading is
available.
Switching the instrument off:

Press and hold
>
goes out.
5.3 Switching the display
light on / off
Switching the display light on/off:

The instrument is switched on.

Press
>
.
(for approx. 2s) until the display
.