ALTANA Micro-TRI-Gloss μ - Manual (Page 9)

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English
2 Safety instructions
Only instruments complying with the requirements for safety extra
low voltage may be connected to the RS 232 interface.
In case an external power supply is used, please pay attention that
the nominal voltage of the power supply (see identification plate
on the power supply) corresponds to the mains voltage of the
mains socket.
Your instrument is cutt off from power supply by
a) taking out the battery or
b) in case of external power supply by pulling the power supply
out of the mains socket.
Please take care that the power supply is accessible at any time.
In case you intend not to use the instrument for a longer period of
time, take out the battery in order to avoid that the battery leaks
inside the instrument and thus causes damage.