... in focus, Can uphold if not used, Comfortable for wearing, more dapper. Medical loupe TypeC1-06Multiple7XWorking distance ... useful in medical field. It is fit for the Microsurgery, Vascular Surgery, head surgery, ... 5X to 8X.It has six working distances for your choosing, which are 340mm, 370mm, ... warranty, customer just needs to pay for the replacement assembly unit cost.P.S. excluding disposables ...