Pen style microscope, 25x,40x,50x, 75x and 100x,Length:129mm, dia.:12mm. with or without reticle, with or without white/ UV LED light, with or without 8x monocular( telescope) function( for 40x model).With or without LED light.Top quality in competitive prices. Also cheap price LED light pen shape microscope, 25x, 50x, 100x available.