The optical theodolite is widely used in topographic survey,
engineering survey, mining survey, construction survey, it’s kind
of very common surveying instrument.
The internal focusing telescope for clear imaging; easy readout,
high accuracy estimated reading; half-movement type of the vertical
spindle, easy rotation, high direction accuracy. One-measuring
process horizontal standard deviation within ±6", one-measuring
vertical standard deviation within ±10".
Telescope amplification times
Objective effective aperture
Dial min scale unit
Divided scale min graduation
Optical centering device sight distance