Laser levels for interior work such as drop-ceiling installation, chair rails and trim work, etc. These lasers generally include a wall or ceiling mount bracket, and remote controls, but no laser detector since detectors are generally used outdoors for exterior work and not indoors. However, some manufacturers do include a laser detector with their Interior Lasers as a convenience or added bonus. These laser levels can be used outdoors but a detector is required when working outdoors since the human eye cannot see the laser line in bright daylight.