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10 Maintenance and cleaning
The product is maintenance-free besides possibly
requiring a battery change. Maintenance or repairs are only
to be done by trained professionals. Clean the product
using a soft, clean, dry and lint-free cloth.
To remote heavier contamination, make the cloth damp
with lukewarm water. Cleaning agents that contain solvents
are not to be used because it can harm the plastic housing
and the labels.