This Pack of 2 Duo Window Reading Rulers are designed for anyone suffering from Dyslexia or symptoms of visual stress, they combine page tinting with tracking support making it significantly easier to focus and read quickly and comfortably.These rulers feature a larger opaque section for viewing lines of text more clearly, recommended for readers that have difficulty line tracking whilst reading. The ruler itself is tinted and is available in a wide range of colours so you can choose the tint that works best for you.These are perfect for both children and adults that suffer symptoms of visual stress. . Improves focus. Suitable for dyslexic learners. Ideal for all ages. Pack of 2. Approximate dimensions (mm) H 210 W 115 D 3