ADA INSTRUMENTS Ruber-X32 Operating Manual page 12

2) Set up the staff at A point. Take readings ''a'' (back staff) along the
staff at A point.
3) Point at the staff which is set up at B point and take readings "b"
(front staff).
4) The difference "a-b" is the elevation "h" point to A point (Pic.13)
Thus B point is higher than A point on 0.511.
(Elevation value will be negative, if B point is lower than A point).
<If the distance between A and B points is too big or height
difference is significant>
1) Divide the distance into several sections and determine the elevation
for every section.
Example:
H=a-b
=1.735 m
-1.224 m
=0.511 m
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RUBER-X32
Pic.13
MEASUREMENT FOUNDATION