What you want to ask is what should I do if the instrument model of undergraduate graduation thesis is wrong? Communicate with the tutor. If the experimental instrument model of undergraduate thesis is wrong, you can apply to the tutor for revision. If the tutor approves the direction and idea of the topic, you can revise it and resubmit it. Graduation thesis is the last link of professional education for undergraduate and postgraduate students in general secondary specialized schools, junior colleges, undergraduate colleges, higher education self-study exams. In order to enable students of this major to concentrate on scientific research and training, students are required to independently carry out summary work and write papers before graduation.