Johnson Level & Tool 1880-4800 Waterproof Electronic Digital Level IP 65 dust and waterproof Extremely accurate SurroundView vials Quick horizontal and vertical calibration and automatic digit inversion for overhead measurements Reference function making any slope "0.0" and hold function locks measurement on the LCD 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.