Main vials have seven graduations on each side of the bubble Auxiliary level vial shows lateral position and assists in horizontal setting Special alloy iron used to obtain freedom from thermal effects One division equals 0.02mm/m or (0.0005") of an inch p
Main vials have seven graduations on each side of the bubble Auxiliary level vial shows lateral position and assists in horizontal setting Special alloy iron used to obtain freedom from thermal effects One division equals 0.02mm/m or (0.0005″) of an inch per foot
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