Johnson I-Beam Levels are lightweight and durable, "Built Jobsite Tough and accurate". The I-Beam series of levels feature field-serviceable bubble level vials – if you ever break one, we'll send you a new one. Simply snap it into place, and you're ready to go. Other innovative features available on Johnson I-Beam levels include oversized, easy to read bubble vials and large, padded hand grips (Johnson was the first level manufacturer to include handgrips on I-Beam levels).