The EQ is a 20 item self-report scale designed to measure decentering and rumination.
Reference:
Fresco, D. M., Moore, M. T., van Dulmen, M., Segal, Z. V., Teasdale, J. D., Ma, H., & Williams, J. M. G. (2007). Initial psychometric properties of the Experiences Questionnaire: Validation of a self-report measure of decentering. Behavior Therapy, 38, 234-246. The EQ 20 items are in Table 1.
Please contact David Fresco if you would like to receive a copy of the measure.