JOES Digital Level works perfectly to check spoiler, A-arm, pinion and trailing arm angles. Measures to 1/10th degree and the easy to read display has a backlight for night use with an auto shut off to extend the battery life. The Joe's Racing Products Level can be user calibrated in seconds. Simply place it on a level surface and push the reset button. The machined steel leveling surface is wide for true and accurate, eliminating distortion that can effect accuracy on models with plastic leveling surfaces.