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 5975-01-311-2779
NSN 5975-01-535-7193
NSN 6130-01-543-9727
NSN 5996-00-010-8112
NSN 6150-01-605-4858
NSN 5950-01-030-4052
NSN 6320-00-110-8005
NSN 7035-00-570-4100
NSN 6650-01-411-3904
NSN 5930-01-466-1089
NSN 6135-01-579-8864
NSN 5990-01-604-0862