Chauvin Arnoux C.A 742 Notice De Fonctionnement page 31

To use the device, hold it in your hand while pressing the
trigger of the red probe tip with your index finger.
Hold the black probe tip in your other hand while pressing
the trigger with your thumb.
To perform a test, press the trigger. That
unlocks the protection of the probe tip,
which can slide. You can then insert it
in an outlet or touch the object to be
tested with it.
31
Ω
AUTO TEST