0&deg; sinuscope &oslash;4x175mm Wolf Stryker Olympus TUV CE&nbsp;With direction index sapphire lens cover never abrasion CE FDA 0/30/70 sinuscope 4x175mm Wolf Stryker Olympus TUV CE Can be sterilized by Gas or Soaking With direction index sapphire lens cover never abrasion AdoptGermany optic fiber and glass Adopt high quality stainless steel materials