The SL-H3 Slit Lamp. Crafted in Europe, S4OPTIK slit lamps deliver clear, precise ocular observation for the clinician. These slit lamps are an essential component for today’s modern office, providing value, ease of use and reliability. The SL-H3 Slit Lamp features a tower illumination design with 3-magnification converging optics. The SL-H3’s easy to position mechanism and pleasurable optics will enhance your slit lamp examinations.