What is the height of a level instrument? What is the back view reading?
1, the level must be three axis relationship check qualified; 2, before reading, level must be precise leveling; 3, the staff must be leveling feet vertical plumb;
The foot and foot pad of the instrument are firmly trampled, and the settlement will not happen in a short time! 5, the minimum level of silk ruler reading more than 0.5 meters; the above conditions are indispensable!
Level of sight height (range) = rear view elevation (must be known) + after reading unit must be unified (usually "rice");
