A set of three textbooks for learning the basics of physics. - Title: ① Physics Basics - Title: ② Sensor Physics Basics - Title: ③ Sensor Physics Basics Answer Key No writing inside. ① and ② have marks where names were erased on the back cover. ① Physics Basics has no writing or folds. It shows signs of use. ② Sensor Physics Basics and ③ Answer Key are unused and in good condition. Thank you for looking.