Trotec T60 Manuel D'utilisation page 24

Do not throw used batteries into the domestic waste, fire or water,
but dispose of them professionally in accordance with the relevant
legal requirements.
Changing electrodes
To change the electrodes release the four instrument casing screws
and remove the part of the casing shell that is released. Now release
the four circuit board screws. The electrodes can now be pulled out of
their mountings and replaced with new electrodes. Then secure the
circuit board again and the part of the casing shell that was released.
B - 10
Care
Always ensure that the instrument is kept as dry as possible
and avoid any contamination between the electrode needles.
Clean the instrument as necessary with a soft damp cloth that
is lint-free. Ensure that no moisture penetrates into the housing.
Do not use any sprays, solvents, cleaning agents containing
alcohol or abrasives: instead use only clean water to moisten
the cloth.
Operating manual – English