The Leica GPM3 parallel plate micrometer provides direct
result readings to 0.1mm and approximated readings to 0.01mm. This makes both
the NA2 and NAK2 into a precise and accurate level for monitoring and
industrial measuring projects or deformation tasks.
For precise levelling the GPM3 is fitted onto the NA2 or
NAK2 telescope objective and locked in position with the knob.
By turning the micrometer knob the parallel-sided glass plate is tilted,
thereby causing the line of sight to be raised or lowered. The range of
displacement is 10mm.
On the scale, seen in the GPM3's eyepiece, the amount of displacement is read
directly to 0.1mm and estimated to 0.01mm.
10”/2mm tubular level accuracy and with a double run with PPM 0.3mm per 1km.