Features:<br> Scale for transparent surfaces can view the entire page.<br> Pure copper-gasket after polishing, not easy to oxidation, wear and durable.<br> Made of high quality plastic ensure durability even under extreme conditions.<br> Good transparent and strong and durable, exquisite appearance, imported ink printing scale.<br> The manual ruler provides accurate measurements through the aluminum chain, providing appropriate tension for drawing straight line parallel to another line or reference points.<br> <br> Specifications:<br> Material: PVC<br> Length: Approx. 45cm/17.72in<br> <br> Note:<br> Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order.<br> Due to the difference between different monitors, the picture may not reflect the actual color of the item.<br> <br> Package includes:<br> 1x Parallel Ruler