Suppose, there are two points on the ground surface let it be A and B.
The instrument can be set up at anywhere but it is recommended to set the instrument approximately at the midway between the two points so as to eliminate the errors in the instrument.
Then level the instrument carefully and direct the telescope towards the staff which is held vertically at point A and focus it.
Take the readings at which the horizontal hair appears to cut the staff. Now hold the staff vertically at point B.
Direct the telescope on the staff which is held vertical at the point and focus it properly. Take the readings on point B and care should be taken that the bubble should be at the centre while taking readings.
The care should be taken that the bubble should be in the centre while taking readings.
If the true difference of the level between the two points is required then it is necessary that the instrument should be set up exactly mid between both the points.
When the point is on the lower elevation the staff reading is greater and when the point is on higher elevation the staff reading is smaller.
When the staff is held at the lower point then the staff reading will be greater and the reduced level is less. If the staff point is on the higher point then the staff reading will be smaller and the reduced level is more.
Automatic Level: Automatic levels, also known as self-leveling levels, are commonly used in surveying and construction. These instruments feature a built-in compensator that automatically levels the line of sight, ensuring accurate measurements even if the instrument is not perfectly level. Automatic levels are easy to use and provide rapid measurements, making them suitable for various leveling applications.
Digital Level: Digital levels are equipped with electronic sensors and display units, offering precise and direct measurements of elevations. These instruments eliminate the need for manual reading of graduated staffs, reducing human errors. Digital levels often have additional features such as data storage, data transfer capabilities, and built-in software for data processing, enabling efficient data management and analysis.
Laser Level: Laser levels utilize laser technology to project a highly visible laser beam, creating a horizontal or vertical reference line. They are commonly used for applications such as transferring levels, aligning and leveling building elements, and setting out slopes.