Carson MR-20 MagniRule is a clear acrylic, distortion-free 1.5x magnifier ruler. Perfect for home, office, or school! Scaled in inches and centimeters. At Carson, we strive to make sure our customers are 100% satisfied with the quality of our magnifiers. We are so confident in our magnifiers that we back them with a Lifetime Limited Warranty! Carson will repair or replace your magnifier if it is found to have manufacturing defects in materials or workmanship. Please contact Carson for additional warranty.