Linda works in a factory. She checks paper used for photos. She looks at two test pictures. She compares the colours in them. The colours must look right. Linda picks up a ruler. She measures the paper with it. She checks that the size is right. She spots a small mark. She looks closely at the paper. Linda reaches for her pen. She writes down her test results. Her notes show what she finds. She holds up another test picture. Linda is pleased with this paper.