Diagnostic measurement devices and methods

A method of measuring an angular difference in a range of motion of the arms of a patient in need thereof, comprising:

• obtaining a device comprising:
• a gripping bar comprising a left end, a right end, and a midpoint equidistant between the left end and the right end;
• a housing attached to the gripping bar at the midpoint, and an angle-determining assembly supported by the housing, the angle-determining assembly comprising
• a weighted needle configured to point vertically when subjected to the force of gravity;
• a base affixed to the housing, wherein the weighted needle is rotatably attached to the base by an axle;
• and
• a compass configured to indicate with the weighted needle an angle between an absolute vertical axis and a vertical axis of the housing perpendicular to the gripping bar;
• having the patient wear a blindfold;
• having the patient grip the left end in the patient's left hand palm facing down and the right end in the patient's right hand palm facing down;
• having the patient raise both arms to both arms' unassisted physiological limits;
• observing on the compass the angle indicated by the weighted needle,
• wherein the angle represents the angular difference in the range of motion of the arms of the patient;
• and,
• diagnosing the patient with an injury, disease, or asymmetry when the angle is 10° or more.