Abstract: An analysis and culture apparatus including several wells, which have a cover that closes the well to form a closed space, as well as at least one inlet passage and one outlet passage for introducing matter to a closed space and for removing it from a closed space, respectively. The cover is formed as a separate cap, which can be removably attached to the well, with which the well can be closed, and to which the inlet passage and outlet passage are integrated.

Abstract: The invention relates to a method and an arrangement for measuring the geometry of grooves in an elongated element, which grooves (2) extend as continuous grooves over the whole length of the elongated element (1), circling around the element, in which method the surface of the elongated element is scanned by of a camera (6). In order to achieve simple non-contact measurement, the elongated element (1) is arranged to travel at the vertex through an annular biconical minor or through a biconical bevelled mirror (3) comprising several plane mirrors, and through a plane mirror structure (4) arranged at an oblique angle relative to the direction of travel of the elongated element (1). An annular laser beam is directed to the plane mirror structure in such a way that the plane mirror structure (4) reflects the beam onto the surface of the elongated element (1) through the outer surface (3a) of the biconical mirror or bevelled cone mirror.