This TTL loupe is a Galileo personal customized product: pupil distance customization, working distance customization, no adjustment, direcly to wear. Specs： 1.Magnification：2.5X 2.Work distance：340mm、420mm、500mm 3.View field:≥φ70mm 4.Pupil distance:56mm、58mm、60mm、62mm 5.Depth of field: standard work distance±50mm 6.Net weight:106g 7.Package size：85*65*170mm 8.Package:zipper bag+paper box Application Dental, ENT, ophthalmology, general surgery,microsurgery, pet surgery,etc