A very sensitive instrument used to establish accurately the horizontal plane. It consists of a machined and scraped metal base with an involute groove or flat base. It has an adjustable or nonadjustable vial which may be graduated or plain. It has no mounting facilities.
Classification: Handtools (including glass cutters) and parts thereof, nesoi, of basemetal
NSN 5925-00-466-0393
NSN 5910-01-412-4949
NSN 6130-01-369-9709
NSN 5935-00-171-0157
NSN 6130-01-350-2132
NSN 5998-01-436-2473
NSN 5835-01-229-6964
NSN 6150-01-220-2006
NSN 5999-01-425-2508
NSN 6135-00-351-8606
NSN 6240-01-621-2774
NSN 4140-00-699-0904