Digi-Pas DWL280PRO Waterproof IP67 Digital Torpedo Level and Protractor, Magnet, LED Bright Display, 9 inch WATERPRROF IP67 CERTIFIED - SHOCK & FREEZE PROOFS; RUGGED design for professional use; Operate in all weathers, from cold winter to hot summer; wide operating temp range -4F to 140F 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 BRIGHTEST LED DISPLAY TECHNOLOGY with magnetic base to securely attach to metallic surfaces with a V-Grove to nicely align on pipe SMART TECHNOLOGIES: to improve accuracy with BRIGHT LED displays in degrees, In/Ft, mm/M, % slope; Auto invert display when gauge is upside down . BUZZER SOUNDS at 0 degree or any set angle RUGGED DESIGN with thick rubberized end caps to wistand strong impact of maximum protection.