A number of surveys have been developed to measure the skills in the TPACK model. Schmidt et al.  have developed a fast and reliable TPACK survey in the form of a questionnaire, consisting of 47 questions answerable on a Likert scale. This survey measures the self-assessed ability of the teacher within each of the TPACK components.
The strength of TPACK as a model is that it underscores that the successful use of technology in the classroom requires more than just knowing the subject and the technology as separate skills, but that teachers have to understand how to achieve their pedagogical goals with the given technology.
A self-assessment survey suffers from the well-known problems of overestimation of one’s skills, which should ideally be objectively measured.
 Herring, M.C., Koehler, M.J. and Mishra, P. eds. 2016. Handbook of Technological Pedagogical Content Knowledge (TPACK) for Educators. Routledge.
 Schmidt, D.A., Baran, E., Thompson, A.D., Mishra, P., Koehler, M.J. and Shin, T.S. 2009. Technological Pedagogical Content Knowledge (TPACK). Journal of Research on Technology in Education. 42, 2 (Dec. 2009), 123–149. DOI:https://doi.org/10.1080/15391523.2009.10782544.