Our DSZ2 and DSZ3 add a device of temperature offset, so they can be good work in the mal-conditions of larger temperature change, expecially apply to transformation observation at a long time.
1)reliable air-damping and wire-hung compensator
2)checking button for compensator
3)temperature offset of compensator
4)changable diagonal eyepiece and so on accessories
5)Standard devitation of 1km double run: 1.0mm
With parallel plate mictometer FS1: 0.5mm
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