Methods and devices for measuring and calculating wheel alignment angles. When the profile of an object is measured with high precision by causing the stylus to follow a measurement surface of the object, a reference ball for calibration is first measured, thereby surface profiling the object. At least one of the first rotation axis and the second rotation axis provides a rotation axis parallel to the display surface of the monitor and perpendicular to a moving surface on which the cart unit moves. A quantized version of the phase profile signal is separated from an error portion thereof. Finally, the oxygen diffusion barrier layer, the grain boundary sealing layer and the rest portion of the nickel-noble metal layer are removed. In another aspect the invention relates to a method for reducing the cost of operating evaporative air coolers.