The L S Starrett Precision Levels are moderately priced and designed for all-around use, for machinery setup and for use by carpenters in the field. The attractive filigree design of these levels provides a lighter weight, and the curved design evenly dissipates excess heat. The base has an involute groove running the full length, which provides a reliable seat for round work. They have a main vial and double plumb vials. Each vial has two graduated lines. The main vials have approximately 19-minute sensitivity, meaning if the bubble moves off the graduated lines an 1/8", the out-of-level is approximately 0.080" per foot.