How can a leveling measure the height of a instrument?
Do not need to know the instrument level is high, the level is just a horizontal line of sight through the horizontal line of sight on forward rear view of reading difference to obtain the difference between before and after treated, the trigonometric leveling instead of four water standards requirement of equipment, is to measure the total station, from the following points to the lens axis, the instrument has marked
The instrument of a level is measured by hand, such as tape measure, and, if it is a standard, it does not need to be measured
