6" or 150 mm ruler caliper designed for precise measuring in professional, industrial, educational, or DIY applications. Made from durable materials, it allows accurate measurement of internal, external, and depth dimensions with easy-to-read markings in both inches and millimeters. Compact and lightweight, it is ideal for workshops, engineering tasks, construction projects, classrooms, and home improvement use. Its practical design combines the functionality of a ruler and caliper in one reliable measuring tool for everyday precision work.