Topographic Abney Level from CST / berger
Topographic Abney Level from CST / berger Close 
Brass construction with durable black finish and two interchangeable aluminum arcs. One arc is graduated in percentage of grade and degrees, 0-60° in both directions. The other arc is graduated in percentage of topographic scale (0 to ±100 ft.). Scale pointer remains stationary; aluminum arc moves with turn of small thumbscrew. Internal focusing by sliding knob on top of tube. 6-1/2" long.
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