Model HJ-GM6 Objective 0.7x-4.5x Distance Adjustment Range 55-75mm, Diameter of circular stage 95mm Handwheel focusing adjustment range 60mm Lifting adjustment range 110mm Diopter adjustment range +-5 Diopter Working distance 95mm Round Circle Hole diameter 83mm. Base Length 240mm Base Width 155mm, Max. Height 290mm Net Weight 3.67kg.