24, Aluminum Box Beam Level, Three Vials Read Plumb, Plumb Level, Johnson Surround View Vials Reflect Ambient Light For Easy Read, Solid Block Acrylic Vials Won’t Fog, Leak Or Break, Impact Resistant ABS End Caps For Durability, ABS Hand Grips For Comfort, Accuracy Up To 029 Degree 05 mmm In The Standard Position, 044 Degree 0750mmm In The Inverted Position