The Stereo-Zoom 23mm Binocular microscope body has a heavy-duty aluminum housing and comes standard with 10X, 23mm super widefield eyepieces and eyeshields. A zoom range of .7-4.5 allows a magnification range of 7X 45X. The zoom ratio is 7:1 and the zoom is adjusted via dual graduated control knobs located on both sides of the head. The body rotates 360 in the focus mount.