... and quantity assured 4) Handful operation 5)Durable using Digital slit lamp system BL-66SSlit lamp specification:Mircoscope Type Galilean stereoscopic microscope ... Spot Diameter(mm) ,φ10,φ5,φ3,φ2,φ1,φ0.2 Filter heat absorption,grey,red free, cobalt blue Illumination bulb 12V ... .slit lamp BL-66 series 3.camera adaptor4.camera splitter Digital slit lamp system BL-66S