The STABILAÂ 26-Inch to 40-Inch Type-XtL Exact-Length Level tool lets you install doors and windows of many different sizes. The expanding level locks in place at whatever length setting you need for each task. The Stabila XtL system is reinforced for exceptional strength and to eliminate flexing so you get true readings. This level has one vertical vial and one horizontal vial, which makes it suitable for both plumb- and level-finding applications. Hand holes make it easy to grip and work with the level. The entire Stabila level weighs just 3.2 pounds for convenient and simple transport. The extendable/collapsible design makes this level very space-efficient for storage.