On production process of tile, a tile matrix is used. Since the tile matrix is heavily worn away, those dimensions must be often checked. In general, several points are chosen for checking dimensions of tile matrix in order to make OK/NG decision whether each measured value is allowable or not.

The DG-4340 digital gauge counter can display the measurement result visually. When the measured value against the setting value is either "Lower" or "Upper", the backlight of LCD changes into red color.