Features 1、Made of high quality optical glass and nickel alloy materials, strong anti drop and shatter resistant capabilities 2、Detachable design, easy replacement of parts, adjustable knob to adjust interpupillary distance, easy to use 3、Light weight, small matching burden, with the attached lanyard, can be easily worn, not easy to fall 4、3.5 times magnification, clear vision, suitable for close work, such as medicine, daily reading, etc. 5、Wide range of applications, powerful functions, fully meet the amplification needs of accuracy operations in the professional field Specification Item Type: Surgical Magnifying Glass Model: 3.5-420 Material: Nickel alloy + optical glass Purpose: surgical magnifying glass Working Distance: Approx. 320mm~420mm / 12.6 x 16.54in Working Field of view: Approx. 60mm / 2.36in Interpupillary distance: adjustable Scope of Application: medicine, electronics, industry, life reading Package List 1 x Surgical Magnifying Glass 1 x Screwdriver 1 x Lens Cleaning Cloth 1 x Lanyard 1 x Manual 1 x Tool Bag