Designs can be altered to improve performance. This variation can be measured by a Wheatstone deflection bridge. The fabrication process can be controlled by altering a number of parameters. This error can be reduced by refining the finite element mesh. The centre-line average can be calculated by the following equation. The barcode can be scanned by the wand. This is the smallest change which can be registered by the instrument. Coding and decoding can be performed by dedicated hardware. The dimensions of the cantilever can be ascertained by measuring the strain gauge.