Patent ID: 8091249

Claim:
A device for measuring the diameter of a circular cross section an object, either stationary or in motion comprising: a housing having a fixed angle pair of jaws that are symmetrical about a longitudinal axis bisecting the fixed angle of the pair of jaws, wherein the fixed angle of the jaws is known; a means for measuring the distance between a point on the circumference of said object and the vertex of the angle formed by said fixed jaws, wherein said object contacts said fixed jaws tangentially, and wherein said point lies on the longitudinal axis that bisects the angle formed by said jaws; and a means for indicating the diameter of the object, and wherein the mechanical means for measuring the distance between the point on the circumference of the object and the vertex comprises a stylus slidably mounted in the housing and projecting outwardly bisecting the angle formed by the pair of jaws, wherein the stylus contacts the point on the object, further comprising a cable operationally connecting the stylus to a spring-loaded pointer pivotally mounted in the housing.