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P-Ruler is a measurement tool designed for construction and curation planning. It uses simple optical projection principles to project rulers onto walls, floors or targets, allowing users to obtain data instantly. They have clear and easy-to-read scales and unit switch ability. Turn on the flash and illuminate the target. It’s fast and easy. Various tools with different functions can be selected as needed, such as straight ruler, a protractor or a rangefinder. It integrates common measurement tools into one lightweight and simple setting tool, freeing workers from carrying multiple heavy tools and allowing them to easily read from distance the values of length, width, height, angles, areas and distances without climbing on ladders.