Abstract: A measuring device for measuring characteristics of a drawing in which a carriage is supported by a pair of wheels for reciprocal motion on a line. A carriage pulse generator produces pulses proportional to the angle of rotation of the wheels rotatably supported at one end. A tracing lever extending from the carriage has a tracing implement on the other end. A tracing lever pulse generator generates pulses proportional to the rotational motion of the tracing lever. A phase signal generator receives signals from the tracing lever pulse generator and generates a phase angle signal received by a calculator in the carriage. The phase angle signals and pulses from the tracing lever pulse generator we used by the calculator to determine one or more characteristics of the drawing being measured by the tracing implement.