This Stereo Microscope Has Sharp Stereo Erect Image Over A Side Field View. Widely Used in Electric Factories, Laboratories, Schools, Pcb Solder and Mobile Repair etc. 45 Degrees Binocular Eyepieces View Head, Convenient Sitting Operation. The Interpupillary Distance is Between 50-75mm. The Working Distance About 7-11cm Specification: Theory: Stereo Microscope DrawTube: Binocular Objective Lens: 2x Eyepieces : WF10X / WF20X Total Magnification: 20x / 40x Total Magnificent 20x = (Eyepieces 10x) x (Objective Lens 2x) Total Magnificent 40x = (Eyepieces 20x) x (objective lens 2x) Top Light : LED Electrical Illumination Interpupillary Distance: 50-75mm Batteries: 2 AA Batteries (not included) Package included: Microscope * 1 If you have any questions about the product, please contact me, we will contact you within 24 s and give you has satisfactory answers.