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electronic vial in total station

dear all,

i would like to know that

what indicates 20' digit in electronic vial?

what is specification of vertical bubble and horizontal bubble in electronic vial?

when i was set my electronic vial in that circle,it is moving, please my i know whats are the reasons for that?

thanking you all 

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  • GEO Ambassador

    not sure i understand about the "vial" you speak of.. can you snap a photo and upload it to give us a better idea?

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