Make any microscope eyepiece 3x as powerful! Just slip your eyepiece into the top and look through for 3 times the power or your regular eyepiece. Fits standard microscopes and eyepieces. Coated optics, unbeatable price! Will work with our student microscope, stereo microscope, and the Leica Scifinder. Coated optics. Keeps wide field wide! Wollensak Optical, quality optics since 1899!