The Children's Acceptance and Mindfulness Measure is a 10-item measure of acceptance and mindfulness for youth. https://ruthbaer.com/academics/CAMM.pdf
Greco, L., Baer, R. A., & Smith, G. T. (2011). Assessing mindfulness in children and adolescents: Development and validation of the child and adolescent mindfulness measure (CAMM). Psychological Assessment, 23, 606-614.
Goodman, M.S., Madni, L.A. & Semple, R.J. (2017). Measuring Mindfulness in Youth: Review of Current Assessments, Challenges, and Future Directions. Mindfulness, 8, 1409–1420. https://doi.org/10.1007/s12671-017-0719-9
Prenoveau, J.M,, Papadakis, A.A., Schmitz, J.C.S., et al. (2018). Psychometric properties of the Child and Adolescent Mindfulness Measure (CAMM) in racial minority adolescents from low-income environments. Psychological Assessment, 30(10), 1395-1400. DOI: 10.1037/pas0000630