You can use one Zoom Binocular Loupes to replace several different loupes with different magnification and different working distance now because our Binocular Loupes is Zoom with magnification from 2.5x to 3.5x & working distance Zoom from 300mm to 450mm. Zoom Binocular Loupes are designed only for optical magnification during examinations and operations. They are lightweight and ergonomically superior. Zoom Binocular loupes can be used in all possible medical needs. They are widely accepted by dental, ENT, stomatology, Gynecology, Cardiology, Brain surgical and Plastic surgery, etc... Features 1. Multi-coated and high grade glass lenses make clean and sharp image. 2. The loupes employ eyepiece with wide field of viewing. The depth of focus is deep and the object can be seen stereoscopically as actual distance feeling. 3. Smart design, convenient for mobile diagnosis. 4. Magnification is Zoom from 2.5x to 3.5x and working distance is Zoom from 300mm to 450mm. 5. Range of Pupillary distance: 56mm to 72mm