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16. Maintenance and cleaning
Maintenance or repairs may only be carried out by a specialist or a specialised repair
shop. There are no components inside the product that need maintenance. Do not open
it (unless you insert or replace the batteries as described in these operating instructions).
To clean the outside of the product, a dry, soft and clean cloth is sufficient. For more
resistant dirt, you can moisten the cloth with lukewarm water.
Do not press too hard on the display to avoid scratch marks or faulty displays.
Never use aggressive cleaning agents, rubbing alcohol or other chemical
solutions, as the surface of the housing will be damaged (discolouration).