This is a practice problem and explanation set for quality control, "Techniques Edition," corresponding to the QC Kentei Test Level 3. I was able to pass using this. As shown in the third photo, there is some writing in pencil. It's just lines and circles. Please be aware of this. There are no markings with a highlighter. There are creases from opening the book, but it's relatively clean, I think. For those who understand that this is a used item, thank you. Retail price: ¥2300