Objective:Grouped From Any Three Objectives of 1X,2X,3X and 4X,Working Distance:1X-55mm,2X-81mm,3X-61mm,4X-57mm Wide Field Plane-Scope Eyepiece:WF10X,WF15X(Optional) Articulated Free Binocular Head,Interpupillary Distance:55-75mm,45?Inclined; Natural Light For Illuminating Gathered By ?0mm Black-white Reversible Stage Plate Rack and Pinion Coarse Focusing Mechanism With Slip Clutch and Tension Adjustment Net Weight/Set:1.6kg; Package:4 Sets/Carton61X35X36cm; Gross Weight/Carton:8kg