Johnson Level & Tool 1457-1000 10-Inch Magnetic Electronic Digital Torpedo Level Angle inclination in 3 construction languages - units of measure (degrees, percent, in/ft (fractional) Self-calibrate and automatic digit inversion for overhead measurements Reference function making any slope &quot;0.0&quot; and hold function locks measurement on the LCD Super strong 10&quot; solid aluminum frame Powerful rare earth magnets hold to ferrous metal surfaces and V-groove frame fits on pipe and conduit Limited Lifetime Warranty: Johnson level warrants this product against defects in material and workmanship of mechanical parts for life and electronics for one year. The company will replace or repair the product if it fails under normal use. This warranty is limited to the repair or replacement of the product only.