For critical machinery set-ups of all types. Ground and graduated main vial of 10-second accuracy - one division equals .0005" per foot. Auxiliary level vial shows lateral position as guide to horizontal setting. Insulated from handling by non-conductive top plate. Level vials positioned to reduce breakage. Made of seasoned cast iron. Base carefully machined and scraped. Black wrinkled finish on non-working surfaces. Furnished in wood case.
