Hilti offers the PR 20 Horizontal Rotating Laser for exterior horizontal leveling and slope setting tasks. With a simple-to-operate control panel and one-button leveling, the Hilti PR 20 Rotating Laser makes horizontal leveling for setting grades, aligning formwork or pouring concrete a snap. Simply turn the tool on and allow it to self-level, then it begins to rotate. The laser's automatic out-of-level shut-off feature helps prevent the user from transferring incorrect measurements if the tool is accidentally moved or bumped. For slope setting tasks, the PR 20 features an adjustable manual slope on the X and Y axis. Hilti.