The laser level is a surveying instrument that measures horizontal and vertical lines using laser light. Marking work on lines that are the basis for construction can be performed with high accuracy. It is used in electrical construction and construction sites. At construction sites, it is used for vertical confirmation of studs and partition walls, frames and doors, fixtures such as tile joints, and horizontal confirmation of ceilings and floors. There are indoor, outdoor, and indoor and outdoor use ones, and there are AC powered, battery-operated, and rechargeable types, so it is necessary to select according to the application. The laser level generally uses two types of mechanisms, the gimbal type and the electronic-leveling type, and the electronic-leveling type has the advantage of being less prone to failure. When the line is difficult to see due to direct sunlight, or when working alone or at a long distance, one can use a receiver to make the work go smoothly. In addition, marking out at a high position can be done by attaching a tripod to the main body.