Celestron 44202 Advanced Stereo Microscope Celestron Advanced Stereo Microscope with 20x power and 40x power stereo Utilizes two light paths and two eyepieces to create an amazingly true-to-life 3D image Has fully coated glass optics Top and bottom halogen illumination working distance is 110 mm or 4.33 inches Comes with Set of 10x wide field eyepieces, 2x and 4x objective lenses