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 6645-00-392-8728
NSN 6135-01-205-5965
NSN 6240-01-586-9718
NSN 5996-00-925-1953
NSN 5975-00-857-3515
NSN 5960-01-135-9778
NSN 6240-00-660-8849
NSN 5985-01-565-1181
NSN 6145-01-497-4319
NSN 6645-00-171-9639
NSN 6150-00-058-8669
NSN 6320-01-461-1390