this clamping force allows the holder to be firmly retained in and securely fitted into in the fork during transport by a user fig2 is a perspective view of a microscope stage 9 of an optical microscope not depicted the microscope can be for example a confocal microscope microscope stage 9 is embodied with a cutout 10 into which slider 4 with a holder 2 having a specimen 1 and mounted in fork 3 is positioned for optical examination with the microscope cutout 10 in microscope stage 9 and slider 4 are configured in such a way that when a slider 4 is inserted into cutout 10 holder 2 and specimen 1 come to rest on a coverslip 11 provided on microscope stage 9 oil immersion can also be used for optical examination of specimen 1 inserted in holder 2 fig3 is a perspective view of a clamping element 14 in which holder 2 with specimen 1 located therein is clamped or immovably retained clamping element 14 possesses a pusher part 16 that is arranged opposite a counterelement 18 counterelement 18 is connected to a connector tube 20 for high pressure through the connector tube high pressure is directed onto specimen 1 that is clamped between counterelement 18 and pusher part 16 pusher part 16 can be displaced.