1. Grouped From Any Two Objectives of 1X,2X,3X and 4X, Working Distance: 1X-55mm, 2X-81mm, 3X-61mm, 4X-57mm 2. Wide Field Plane-Scope Eyepiece: WF10X,(Optional: WF15X ,WF20X) 3. Total Magnification: 10X-20X, or 10X-30X, or 10X-40X, or or 20X-40X 4. Articulated Free Binocular Head, Interpupillary Distance: 55-75mm, 45º Inclined; 5. Natural Light For Illuminating Gathered By Ø60mm Black-white Reversible Stage Plate 6. Rack and Pinion Coarse Focusing Mechanism With Slip Clutch and Tension Adjustment |