The Toronto Mindfulness Scale-State Version (State TMS) is a rationally derived 13-item, two-factor self-report questionnaire designed to assess an individual’s capacity to invoke a mindful state as measured immediately following a mindfulness meditation experience. The TMS developers conceptualized mindfulness as having two components: (1) an intentional self-regulation of attention toward present experience and (2) a curious, accepting, and open orientation toward present experience as it arises. Based upon this meta-cognitive definitional framework, the State TMS comprises two factors: Decentering, which reflects an awareness of one’s experience with some distance and disidentification rather than over-identifying with thoughts and emotions, and Curiosity, which reflects an attitude of wanting to learn more about one’s experiences. Although evaluations of the substantive validity of the State TMS subscales have demonstrated moderate to good internal consistency as well as good convergent and discriminant validity, no studies beyond the initial validation study have independently examined the psychometric properties of the State TMS factors when using the standardized protocol.