Abstract: The present invention presents a novel indicator for a multiwell plate (10) having a predetermined array of wells, and a multiwell comprising the same. The indicator comprising a pierceable foil member (20) adapted to cover the top portion of the plate, and an array of signs located on the upper surface of said foil member, adapted to indicate the location of the said array of the wells. The foil is adapted to cover said plate so at least a portion of said array of signs is overlapping said array of wells, so when the foil member is pierced by a means of a pipette (42) at the location of said sign, a noticeable deformation is obtained at the upper surface of said foil member and a clear indication is provided. The present invention is also providing for a method for indicting each sampled well in aforesaid multiwell plate.