0100 PA-19 Prism Nodal

The prism has three mounting positions, withe three typical constants:

• 0mm constant if the prism is mounted without the central adapter and placed in the side where the target indicate 0 mm.
• 30mm if the prism is mounted with the central adapter and placed in the side where the target indicate -30 mm.
• 40mm if the prism is mounted without the central adapter and placed in the side where the target indicate -30mm.

  In the position -40mm, the prism performs it function “Nodal”guaranteeing an unambiguous measurement either the vertical angle both the horizontal angle regardless of the inclination of the same prism.