Stereo Zoom Microscope Eyepiece Type Binocular Microscope Type Stereo Light Source LED Optical Field of View 20 mm Optical Magnification 0.67X to 45X Maximum Magnification Capability 20X Base Dimensions 10 1/4 in x 7 1/2 in Manufacturers Warranty Length 1 yr Working Distance Fixed Eyepiece Protractor No Features Focus Adjustment Objective Magnification Adjuster Reflected Led Light Adjustment Transmitted Led Light Adjustment