Patent ID: 8250771

Claim:
A measuring tool comprising: a ruler having a first end, a second end opposite the first end, and a length extending between the first and the second ends of the ruler; and a protractor unit coupled to the ruler, the protractor unit operable to slide along at least a portion of the length of the ruler between the first end and the second end, wherein the protractor unit comprises: a sliding lock movable between at least a first position, a second position, and a third position, wherein the protractor unit is operable with the sliding lock in the first position to slide freely along the length of the ruler and in the second position to be locked against sliding along the length of the ruler, and a protractor component pivotally coupled to the protractor unit, wherein the protractor component is operable with the sliding lock in at least the first position to pivot freely on the protractor component and in at least the third position to be locked against pivoting on the protractor component.