1) Durable using in stainless steel material 2) skillful manufacture 3) ... °,20° Light Spot Diameter(mm) φ9,φ8,φ5,φ3,φ2,φ1,φ0.2Filter heat absortion,grey,red free,cobalt blueIIIumination Bulb ... .28m Carton Number 2Total Weight 40kg slit lamp microscope BL-III(A)