Patented Tourniquet Bungee System for hands-free leveling on pipes, 2x4s and other surfaces 33% higher visibility, epoxy locked vials features 2% slope lines or 1/4" pitch and an accuracy of 0.0005”/1” Aluminum box beam delivers guaranteed accuracy and lifetime durability Invertible vial allows for accurate reading upside down using the milled surface Tool-free, removable shock-absorbing end caps will protect against shock and drops Ergonomic grip on handle for comfort and portability Drop-tested to exceed MIL-STD-810G to ensure durability on the toughest job sites Limited lifetime warranty