Foif J2-2, Инструкция по эксплуатации

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Applications:
J2-2 optical theodolite is a kind of precision angle-measuring instrument. It plays a
very important orle in geodesic survey and engineering measurement, therefore it is
widely used in third-order, fourth-order trainglulation, building, roadwork, pipe
playing, trnnelling, mining, cadastral survey as well as machine tooling and
installation etc.
Technical data:
Accuracy
Standard deviation in horizontal direction
measured
at face left and face right ±2
″
Standard deviation in vertical angles
measured at
Face left and face right ±6
″
Telescope erect image
Clear objective aperture 40mm
Magnification 30×