1. A component piano string angle gauge, for piano strings which strings each comprise a front string, a bridge string segment where the piano string is in contact with a piano bridge, and a rear string, for use in the measurements of angles between the front strings and rear strings and a projected line between a pair of bridge string segment termination points, the bridge string segment termination points being the location of the intersection between the front and rear strings and the bridge string segment, said component piano string angle gauge comprising: a. a base; b. two gauging fingers, extending from the base, having string contacting bearing surfaces on their ends; c. means for adjusting the relative distance between the two gauging fingers, whereby the relative distance between the gauging fingers may be increased or decreased so as to allow placement of the string contacting bearing surfaces of the gauging fingers at the bridge string segment termination points; d. angle measuring means mounted to said base; and e. means for calibrating said angle measuring means relative to the position of the string contacting bearing surfaces of the gauging fingers.