All of the lens are multi-coated preventing from reflect-ion, humidity. The mildewproof design offers fair pictur-es. This model can be equipped with applanation tono-meter and measurement eyepiece. Specifications Type: Converging Stereoscope Total Magnification10X: 10X, 16X 16X: 16X, 25. 6X Slit Width:0~9(mm) continuously adjustable Slit Height:1~8(mm) continuously adjustable Aperture Diameter: Φ9,Φ8, Φ5,Φ3, Φ2, Φ1, Φ0.2(mm) Slit Height: 1~8(mm) continuously adjustable Slit Angle: 0~180 Filter: Heat Absorption, Grey, Redfree, Cobalt Blue Slit clination: 5 ,10,15,20 Illumination Bulb:12V/30W Halogen Bulb Input Voltage: 110V/220V 50/60Hz Power58VA