I-Beam Level, Heavy-Duty Aluminum, 72-In. Security\/Motion & Light Activated Lights Works with most single stage

Works with most single stage heating and cooling systems

simply position & lock in place

Won't Deteriorate Under Extreme Temperatures

1/2" in size or 3/8" 5/8 in size

Won’t harm lawns1

I-Beam Level, Heavy-Duty Aluminum, 72-In. Security\/Motion & Light Activated Lights Works with most single stageA level is only useful if you can read the vials. This level comes equipped with oversized 1 2" field replaceable vials. Not only are the vials themselves easy to read, but the level has more vials than competitive models in 48" and longer lengths, meaning the vials are always within eyeshot, even at awkward angles. Finally, Johnson's SurroundView(TM) technology maximizes visibility and top read windows allow the user to stand over the work to view