Pentax W-1502N Series Instruction Manual page 58

④Collimate
B,click "M.Dist" key.
⑤Click
"Continue"
key,then horizontal
distance(dHD), elevation
difference(dVD)
slope distance
between prism A and
prism B will display.
※1）
⑥In order to calculate
the horizontal distance
between points A and
C,collimate prism C,and
click "M.Dist"
again.Thus horizontal
distance between
instrument and prism C
will be shown..
prism
【M.Dist】
【Continue
and
】
(dSD)
【M.Dist】
key
48