I-BEAM SERIESGeneral purpose levels for construction. The I-Beam level is a less expensive option for levels. By design, they arelighter and less durable than our Box Beam levels. If treated carefully these levels can provide a long life; however,they do not have the robustness of the Box Beam level. These lighter use levels need to be checked more regularlyfor accuracy.Tube vials used in I-Beams are more susceptible to damage than the acrylic vials of our Box Boom series. Onematerialend caps provide some protection from accidental drops and misuse