Flat glass for demanding industrial tasks is subjected to 100% testing after the production. Dimensional accuracy is important for industrial glass which is used for demanding technical tasks. Examples of such types of glass would be windscreens, display glass for LCD televisions or glass for the production of photovoltaic modules. Even a small deviation from the required geometry or thickness can drastically influence the later function of the glass. The glass profile measuring system uses confocal sensors. These operate with white light and precisely measure the profile of the pane and also an inner layer. A laser scanner is also used for determining the measurement.