During the learning process, especially in physics, students experience many difficulties solving a problem. The difficulties will lead to misconceptions about learning indicators experienced by students. It will cause students to have trouble understanding the following material because one concept and another are interconnected and have a hierarchical relationship in studying physics. Therefore, it is necessary to identify students' misconceptions. One of the ways to identify students' misconceptions is using a diagnostic test. In this paper, the author discusses the extent of the advantages of diagnostic tests for high school students in learning physics to identify students' misconceptions.