A great advantage of the MeoMag 3x is the focusing eyepiece, which helps to remove the dioptric defect of the user&';s eye and at the same time adjust a sharp image. Extend the range of the MeoRed-T and T-Mini scopes for close quarter optics.. The MeoMag 3x magnifier can be used in conjunction with the MeoRed-T and T-Mini to extend the range of these close quarter optics. Mount is not included in the package.