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 6135-01-222-0703
NSN 6105-01-461-8898
NSN 6220-01-363-5510
NSN 5930-00-403-4631
NSN 5985-00-225-8621
NSN 2925-01-194-9737
NSN 6130-00-992-9733
NSN 6220-00-660-5539
NSN 4140-00-383-8230
NSN 6645-00-071-8173
NSN 6620-01-538-7174
NSN 6620-01-276-7057