A cross laser level is a tool that measures and indicates the horizontal position by emitting a laser beam. It can determine the position of the horizontal plane by cross laser lines in horizontal and vertical directions, thus helping people to precisely determine the position of horizontal and vertical planes when doing construction, decoration, carpentry and other work. The cross-line tools usually includes a laser, a set of precision turntables, a horizontal bubble meter, a high precision horizontal scale and a photoelectric detector and other components. Its advantages are high measurement accuracy, high working efficiency, easy operation, etc. and wide application range. Common crosshair products include handheld, desktop, tripod-supported and rotary models.