A versatile range of colour video magnifiers designed for desktop and distance viewing Its elegant style is aesthetically pleasing and would look at home on any desk, in the living room or at work. At school or college, the Sentry can be used for viewing atlases and maps, completing worksheets including the use of drawing tools such as set squares and pairs of compasses, electronics, using physical materials in chemistry and geology, and examining and manipulating specimens in biology and zoology.