Pentax ETH-310 - Manual (Page 42)

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6.6 Difference of the vertical angle
Inspection
Set the vertical angle in Zenith 0° mode
Sight an object (Point P) with the telescope and read the vertical
angle (V correct).
Reverse the telescope and rotate the alidade.
Sight point P again in the reverse position and
read the vertical angle (V reverse).
At this time, when (V correct + V reverse - 360°)/2 is less than 15”,
it is within tolerance. If it shows a larger value,
it needs adjustment - Consult your dealer.
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