The lenses in the double lens magnifiers can be used alone or in combination to produce the desired magnification. The case can be used as a handle when the magnifier is in use. Magnification range is 3x, 4X or 7X. Notes:These magnifiers consist of models that have double lens systems offering extreme versatility.The lenses in the double lens magnifiers can be used alone or in combination to produce the desired magnification. The swing away case is designed to be used as a handle when the magnifier is in use and a protective case when not in use.