Johnson 72" Heavy Duty Aluminum I-Beam Level. It has oversized 1/2" diameter vials that are easy to read. The job site tough ergonomic cushioned hand grips provide comfort and control. The surround view vials reflect ambient light for easy reading and the top read window maximizes readability. The field replaceable cover plates and vials make it easy to maintain the level. The shock absorbing end caps protect the frame when dropped. The level has a lifetime accuracy warranty.