The review ruler is a high grade durable plastic ruler featuring an innovative viewing window for line by line reviewing.  It comes in a pouch for storage.  It is a 30cm ruler, and has both millimetres and centimetres. However the thing we like most about this ruler, and why we stock it, is that the viewing window is raised and acts as a grip – which provides added stability and also helps kids draw lines and measure without their fingers getting in the way. I also often use the review ruler as a guide for kids while they’re reading, if they often lose their place or having tracking issues.