Technical characteristics:
Instruments Model : D-120
 Per kilometre from the measurement standard deviation :± 1.0mm * 1
Telescope :Just as
Magnification :32 ×
Effective aperture :40mm
The shortest-horizon :1m

By constant :100
Constant increases : 0
Compensator :± 15 '
Anping accuracy :± 0.4 "
Yuen Kok value blisters :8 '/ 2mm
Characterization of disk : 360 °
At intervals of : 1 °
Temperature : -30 ° ~ +50 °
Weight machines : 2kg