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 5945-01-064-2277
NSN 5990-01-411-1917
NSN 6650-01-406-5322
NSN 6135-00-377-9165
NSN 6620-01-514-2949
NSN 6685-00-202-5233
NSN 5835-00-885-6030
NSN 6610-00-433-8700
NSN 6150-01-625-9689
NSN 6150-00-498-6623
NSN 6650-00-223-7301
NSN 5975-01-067-7638