Hazet-Werk 4812 N-10/3AF Notice D'utilisation page 29

First Time Use
Step 1: Turn the thumb screw loose counterclockwise, then open
the battery cover.
Step 2: Place battery in correctly, put the battery cover back on,
and then tighten up the thumbscrew.
Step 3: Insert probe into the device connector and tighten it up
clockwise.
3 Design and Function
29