This is a practice question book and explanation guide for ultrasound examiners in the digestive system field. I am selling it because I have finished studying. It's a very easy-to-understand question book! There are 72 questions in total. The practice questions are in black and white, and the explanations are in color. (Not the original.) Please note that the practice questions are in black and white and may be difficult to see in some places. I was able to work through many questions, and it was very helpful for exam preparation. Ultrasound Examiner Digestive System Field Ultrasound Question Book