DigiPas DWL80PRO Pocket Size Digital Level, Electronic Angle Gauge, Protractor, Angle Finder, Bevel Gauge, 0.05&deg; 4 inch DUAL FUNCTIONS - tilt/angle gauge to set and also check relative angles between two surfaces using Alternate Zero function PRECISION & EASY RE-CALIBRATION by user back to factory setting with no special fixture; RESOLUTION: 0.05 (0 & 90), 0.2 other angles, switchable display between (), slope (%), mm/M, inch/FT STRONG MAGNETIC BASE: securely attach to fences, saw blade & base, and other metallic surfaces SMART TECHNOLOGY SENSOR; improve accuracy with precise displays in degrees, In/Ft, mm/M, % slope; Auto invert display when gauge is upside down Measurement Range 0 ~ +/- 90 x 4 (360) with full temperature compensation ensuring accuracy of measurements within 32F to +122F