Root mean square error of excess measurement per 1 km of double level line.....1,5 mm 
with the use of optical micrometer as an adapter   ..... 1,0 mm
Telescope
magnification ...... 30x
image ..... correct  
resolution ..... 3,6''
inlet pupil diameter ......  40mm
angular field of vision .....  1°30
network of filaments ..... cross-hairs and wedge
Filament range finder ratio  ..... 100
Compensator (device of automatic correction of aiming axis inclination)
damping system  ......   magnet
working range  ..... ±15'
installation error ...... ±0,5''
Scale division of an adjusting round level .....10 
Horisontal circle ..... 360 or 400 gon
circle diameter ..... 107 mm 
division interval ..... 1 or 1 gon

Mass, kg:
level 4N-2KL in  a case with instrument and cover..... 3
telescopic tripod of light metal with filament lead ..... 3,8

Accessories
Divisible 3-m level rod, metal, vertical, with straight numerals, 
centimetre divisions and round level;
adapter- optical micrometer for a rod with centimetre divisions;
adapter- pentaprism for an objective;
lens adapter for an objective;
level for a rod.