GemRed Digital Angle Finder (Crown Molding Protractor Accuracy(0.1 degree)) Best tool for crown molding measuring. Calculating spring, bevel, wall angels Accuracy: 0.1. Resolution: 0.05. Working temperature: -10 ~+50 Easy calibration and Zero setting. Lock the moving blade at any angle High accuracy level bubble for measuring horizontal level easily. Automatically-reversed display for up-side-down measurement. Product length: 488mm