Microscope, Eyepiece Type Trinocular, Microscope Type Stereo, Stand Type Articulating Arm Stand, Light Source Not Applicable, Optical Field of View 20 mm, Optical Magnification 0.7X to 3X, Maximum Magnification Capability 30X, Vertical Extension 14 1/2 in, Horizontal Extension 20 3/8 in, 23 in, Base Dimensions 10 in x 10 in, Manufacturers Warranty Length 5 yr, Working Distance 97 mm, Eyepiece Protractor No, Features 4.3:1 Zoom Ratio, Airtight and Anti-Mold Design