In the engineering and construction industries, laser pointers are often used for marking and measurement. For example, in construction, laser indicators can be used to mark the horizontal or vertical lines of walls to ensure the accuracy of the construction. The high precision of laser flashlights makes them indispensable in construction projects, especially in tasks that require precise measurement and alignment. Laser indicators can be used to accurately indicate buildings or equipment from a distance, assisting commanders in remote command and monitoring.