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Enlist the advantages of Auto level. 
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Following are the advantages of auto level:

1) Operational Comfort: Use of Auto level is free of fatigue, does not cause strain on eyes, nerves etc.

2) High precision : Precision of auto level is about ± 0.5mm to 0.8 mm for one km

3) High speed: Time required for leveling is about half of that required with ordinary level.

4) Freedom from errors: Bubble usually remain in center and image of staff is erect, easy to read

5) Freedom from external influences: No influence of cloud, rain, magnetic field, vibrations, etc. on the levelling work with Auto level.

6) Range of application: Auto can be used for medium and large size project. To establish bench marks accurately.
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