Pentax W-1502N Series Instruction Manual page 52

②Select
"with
button with stylus.
③Input the prism height
following PH.
④Collimate the centre P
of prism.
⑤Click "M.Dist" key to
start measuring.
⑥Horizontal
distance
between instrument
and prism will
shown.
【with PH】
PH"
Input prism
height
Collimate
prism
【M.Dist】
be
42