Digital Level This unit is designed to be job site tough. The box frame is extruded from high strength aluminum. The two bubble vials are machined from solid acrylic blocks and are virtually indestructible. The unit’s Sensor Module is encased in a high impact resistant ABS polymer case, sealed against dirt and water penetration. The Digital Level can be recalibrated in seconds with the touch of a button. Pitch Gives roof pitch readings — in inches of rise per foot of run – right on the display. No two-handed measurements, no conversion calculations and no mistakes. Reads In Degrees Set saw blade angles to a fraction of a degree accuracy with SmartToolTM. Easily duplicates a stair angle for setting hand rails Listen & Level Audio Feature The beeper sounds when SmartToolTM is level and/or plumb. % Slope Read angles in % slope to meet requirements for sewer connections, ADA ramps and grading. A Available in 24″ Length Can be purchased as a complete system in 24-inch rail lengths. The 6.64-inch module can be used as a torpedo level for small tasks, or locked into any American brand carpentry and construction series levels.