The Plain Window Reading Ruler has the benefits of the Duo Window without any of the additional markings. This makes it ideal for use when reading diagrams or figures.
The Eye Level Reading Ruler is a colored overlay text highlighter about the size of a six-inch ruler. Discreet and portable, the reading ruler is made of a combination of opaque and transparent plastic that both underlines the text and highlights it in a colored tint. Simply read the text through either of the tinted plastic strips of your selected color, and track down the page: broad strip for paragraphs; narrow strip for single lines.