The Easy Read™ Rulers are designed to eliminate the confusion and strain of reading your typical ruler. On the English side, each line is marked, so there is no guessing or counting lines! On the metric side, the millimeter hash marks rise and fall making it easy to identify the measurements. The Easy Read™ Ruler is available in plastic or durable stainless steel. High contrast, vibrant colors provide a non-glare surface to enhance the user experience. Patent 4,573,758