The Quality Scanner 3D can combine up to 3 Detection channels in one device. If looking through a glass against a bright or dark background, or even looking at the glass surface in reflection, you can see different defects showing up: high contrasted defects like inclusions, bubbles or scratches against a bright background, smooth and low contrasted defects like hairline scratches, cork marks or other smooth residues against a dark background or LowE coating scratches or pinholes in reflection.