TSB sensor controls the edge of the material following one printed line or a reading contrast.
The error is detected by one hi tech LED linescan array sensor with the automatic gain adjusting for the background. TSB sensor is supplied with a red pointer to show the center reading on the line/contrast. The autocalibration procedure obtain the starting contrast directly on the line/contrast. The zero is settable in order to change the offset level. In the most evoluted systems the scanning head is motorised.