Johnson's magnetic welder's torpedo level makes it easy to measure plumb, level &45 as you weld. Its solid aluminum frame dissipates heat quickly, &its acrylic block vials withstand abuse. And adding to the level's versatility, its "SurroundView" vials reflect ambient light for easy viewing under your welding helmet, &the powerful "GripTight" V-groove rare earth magnets hold the level tightly to flat or curved ferrous surfaces.