• Set up the levelling staff vertically on the target.
• Level the instrument and focus on the levelling staff.
L
= Distance Instrument to target
Δ
– l
Formula: L
= l
Δ
1
= 1,016 m – 0,893 m x 100 = 12,3 m
Example: L
Δ
Height reading
Measure and calculate distance
x 100
2
Reading l
Reading l
Reading l
- 12 -
= 0,956 m
x
= 1,016 m
1
= 0,893 m
2