RMS error 
of elevation measuring:
per 1 km of  double run, mm.....  2
with micrometer, mm......  1 
Telescope magnification ......  30x
Compensator operating range ......    ±15’
Compensator error .....   ±0.3’’ 
Value of plate level division .....  10’

Prism adapter
The prism adapter to the level is intended for vertical surface
creation in construction areas and when carrying out explorations
within hardly accessible regions.

Micrometer
The set on optical micrometer (NOM) to the level is intended
for increasing accuracy of elevation measurements. The micrometer 
is delivered in its own case.

Specifications:      
Operating range, mm ..... from 0 to 10