Starrett 132-6 Bench Level. One main vial & double plumb vials. Attractive filigree design of these levels provides a lighter weight, and the curved design evenly dissipates excess heat. The base of the levels features an involute groove running the length of the base, which provides a reliable seat for round work. Main vials have approximately 19-minute sensitivity, if the bubble moves 1/8" off the graduated lines, out-of-level is approximately .080" per foot Made in USA.