When is it necessary to adjust the pressure in the reference scale of an alitimeter?

Question

Question PPL(A) - Private Pilot License - Aircraft General Knowledge

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Before every flight and during cross country flights

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Every day before the first flight

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Once a month before flight operation

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After maintance has been finished

Id 119 - PPL(A) EN - When is it necessary to adjust the pressure in the reference scale of an alitimeter?