Introduction of Level work, Parts of level & requirment of Leveling work

In this video, I explain about Automatic level and its parts and also I explain what terms are using in Level work in Surveying. also, I explain shortly about Back SIght, InterSight ForeSight Height of Instrument, Datam Line, Line of Collimation, Level Surface, Station Points, Change Station Reduce Distance Reduce Level and many more about Level Work