Cross-Line / Horizontal / Vertical : A Linear Laser Level is a point-to-point level that projects multiple horizontal and vertical laser lines using multiple LED diodes.
Rotary: The Laser Rotary Levels project a rotating dot to create a 360-degree line. A detector is used to read the laser lines at long distances.
Dots / Points: The Laser Pointers project a point that can be flat, square, or vertical.