1、Durable Material: Made of aluminum alloy. The surface is black sanded and anodized, which is wear resistant, rust resistant and pleasant to the touch. 2、Multifunctional Design: The ruler not only realizes the function of ordinary vernier calipers, but also adds angle measurement and marking functions. 3、Ergonomic Design: The lightweight ruler is ergonomically designed to reduce pressure on your elbows or wrists. The surface is smooth, and does not hurt the hands. 4、Portable: Not easy to wear, the lightweight and compact designed ruler is designed for your long term use, and the T ruler can accompany you for a longer time. 5、Fine Workmanship: Designed to follow strict quality guidelines and superior workmanship, ensuring highly accurate and precise measurement marks for consistent and reliable results.