Plumb & Level, Aluminum, 48-In.Jobsites are rough, and Johnson's levels are designed to be strong and durable enough to take on that jobsite abuse. This box level comes equipped with solid block acrylic vials that won't fog, leak or break, and the shock absorbing endcaps protect the level when dropped, ensuring it stays accurate for life. When working in poorly lit areas, the SurroundView(TM) vials reflect ambient light to keep them easy to read.