With four vials, this 12 in magnetic torpedo level accurately measures plumb, level, 45 deg and slope Its solid aluminum frame is highly durable to survive even the toughest jobsite abuse It was also designed to be easy and convenient to use its topread window lets you view the level vial easily from any angle and the SurroundView vials are larger than the competition’s at 12 in Dia and reflect ambient light, making them exceptionally easy to read This level also features powerful GripTight magnets that hold to flat or round ferrous metal surfaces for convenient, handsfree use, while the Vgroove frame fits easily on pipe and conduit