Patent ID: 7934322

Claim:
A digital protractor for measuring an angular displacement from a reference surface to a second surface, each of which surfaces includes a magnetically attracted material, said protractor comprising: a pair of pivotally interconnected upper and lower arms, which arms are superposable upon one another, each arm having at least one engagement edge extending longitudinally of said arm, one of said arms being engagable along an engagement edge thereof with the reference surface, the other said arm being engagable along an engagement edge thereof with the second surface, at least one engagement edge of each said arm carrying a magnetic element for releasably adhering said arm to a respective one of the reference and second surfaces, whereby each said arm carries at least one said magnetic element and said protractor carries at least two of said magnetic elements; an electronic sensor secured to one of said arms; and a digital readout device secured to the other said arm for operatively cooperating with said electronic sensor to measure and display the angular displacement from the arm engaging the reference surface to the other arm.