... 3. Long working distance, large depth of field. XTL-II series zoom stereo microscopeXTL-II possess the advantage of long working distance, large ... forensic identification ,and gem identification. Part NameTechnical SpecificationXTL-IIXTL-II(F)XTL-II(L)Total Magnification7.5X-35X3.75X-140X(with xl eyepiece ... eyepiece 0.5X,1.5X,2XRing fluorescent bulb,Ring LEDcarton XTL-II series zoom stereo microscope