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 5990-01-116-2181
NSN 6145-01-398-0607
NSN 5930-00-110-0753
NSN 5920-01-096-1864
NSN 5935-01-597-8271
NSN 6685-01-491-2642
NSN 6650-00-287-5868
NSN 5925-01-261-7872
NSN 5835-00-468-3367
NSN 6620-00-988-9170
NSN 5996-00-188-7063
NSN 5945-01-142-7784