Specifications Objective/Eyepiece 1X to 5X 0.6 to 4X 15X SWF 15X to75X 9X to 60X 20X SWF 20X to100X 12X to 80X View Type : Binocular Stereo Microscope (Trinocular) Focusing : With Rack & Pinion System Zoom Ratio : 1X to 5X (or 0.6X to 4X) Stage : Condenser Bright Field With Iris Diaphragm On Rack & Pinion Illumination : Built in 6V-20W Halogen Lamp Packing : Packed in Thermo Coal Box Accessories Vinyl cover, Duster, Cleaning Brush