The physics education community has long recognized the need for valid and reliable assessments of content in physics courses, and education researchers have developed numerous assessments with the intent of measuring student learning. These conceptual surveys have done much to awaken the physics community to the understanding that while traditional didactic instruction may train students to produce correct solutions to seemingly complex problems, such instruction often does little to alter students' fundamental conceptual thinking. PhysTEC provides links to several assessment instruments, as well as strategies for employing them.