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 6620-01-163-1613
NSN 4140-00-550-2994
NSN 4140-01-470-0542
NSN 5996-01-580-0582
NSN 5998-01-588-5827
NSN 5990-01-298-2494
NSN 5945-01-065-5388
NSN 6650-00-578-6543
NSN 6610-01-468-0679
NSN 6145-00-067-7088
NSN 6240-00-331-8732
NSN 5905-01-491-9392