This display case for preserving and displaying objects in a protected environment, comprising:- a display space (30), delimited by separating walls comprising a lower plane (22), side walls (23) and a ceiling (24),- means for adjusting and controlling air climate in the display space (30), comprising:- a hygrometric probe (61) for detecting the relative humidity inside the display space (30),- a control unit (25), connected to the hygrometric probe (61).The adjusting and control means further comprise a first relative humidity control electrolytic membrane (41), located in a first opening (51) formed in one of the separating walls (23), activated by the control unit (25).
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