Optical levels are mostly used for accurate levelling in surveys, building construction and industry. To use this tool, the operator looks through the eyepiece of the telescope. Optical laser levels are not suitable for the DIY projects. They fulfil the needs of engineers, builders and contractors who require a level that is very accurate. Generally optical laser levels must be used by professionals and if you need do surveying you must employ a professional surveyor because doing that with Optical Laser Levels is a skilled job and requires a great deal of preciseness.