The S300II is designed for the discerning lab technician, dentist, Q.C. personnel, hobbyist, etc. The optics (made by Olympus), has extraordinarily bright visibility needing only normal ambient lab bench lighting for viewing. It is very portable, requiring minimal lab bench space and no electricity. Working distance is approximately 5 1/2″ beneath optics or 11″ below viewing lens. An optical glass shield that is easily cleaned, seals out dust or dirt or other contaminants. The optics rotates 360 degrees. The 30 cm (12″) Flex-neck (standard) makes viewing and focusing simple and hands free with almost infinite adjustment.