... ~ 10mm continously adjustableSlit height: 1mm, 3mm, 5mm,10mmDiameter of light spots: 1mm, 3mm, 5mm,10mmFilter: Heat absorption, gray, Redfree, Cobalt blueIllumination ... : 18VA Net Weight 750g, portable for carry,with four light spots, equip with all functions of a desktop slit lamp,Volume ...