A covering for apertures of reaction receptacles formed in a microtitration plate, including a hermetic, elastically deforming mat or foil, a frame, and connecting elements. In particular, a lock detector configured to detect PLL stability for a user-defined period of time prior to asserting a PLL-lock-detected output. The device can anticipate the user by directly sensing the user, such as by weight biometrics, size, voice recognition, electronic key tag, and the like or by time or location. Geometrical and functional analysis of the knee are possible. The present invention provides an apparatus for applying microcurrent to eyes, and the apparatus is used for the method.