1. Use the Softmenu switch [2] Area / Circ to select 2D Trace. “2D Trace” is displayed on the left side of the screen.
2. Use the trackball and the Set button on the control panel to specify the start point for tracing over the contour of the measurement area.
XPlace the cursor at a desired position with the trackball, and press the Set button.
3. Trace the curve so that the measurement cursor returns to the start point, and then press the Set button.