3 Vials - (1) Level, (2) Plumb. Accuracy of 0.0005 in/in (0.5mm/m). Magnified Center Open Top Read Vial. Rare Earth Magnets Are Embedded into the Level For Stability and Then Milled To Provide Better Accuracy. Non-Marring, Shock-Absorbing Rubber End Caps. Bi-Material Hand Grips, 1 Hang Hole.