Changing The Battery - E+E Elektronik OMNIPORT 20 Manuel

Manual
open battery case OMNIPORT 20
7.

Changing the battery

If the symbol "BAT" appears in the display, the batteries have to be
replaced. Open the battery case at the back of the instrument.
Remove the empty batteries and insert new ones.
Use only batteries of type IEC LR6 AA.
Don't use accumulators!
Reverse polarity may destroy the instrument ; make sure to place
the batteries in the correct position and to use high quality batteries
only.
OMNIPORT 20 english
page 47