The Trait Meta-Mood Scale (TMMS) is a 30-item, 3-factor self-report measure of perceived emotional intelligence, which had relevance for mindfulness research. The scale was designed to provide an index of meta-mood experience which involves monitoring, evaluating, and regulating emotions. The TMMS purports to measure three components of emotional intelligence, which corresponds to its three subscales, namely Attention (attention to feelings), Clarity (emotional clarity), and Repair (mood repair). The Attention subscale measures attention to feelings, that is how much attention individuals pay to their inner feelings and emotional states. Clarity subscale assesses emotional clarity, the ability to understand and discriminate among feelings in oneself. Repair subscale examines mood repair, the ability to regulate moods and repair negative emotional experiences. The preliminary psychometric evaluation studies demonstrated TMMS has sound internal consistency, test-retest reliability, discriminant validity, and convergent validity. Later studies have raised concerns about the discriminant validity of the Repair subscale and construct validity of the Clarity subscale. Other limitations include lack of cultural sensitivity of the Attention scale, situational specificity, and mood specificity. Despite its limitations, the TMMS has potential utility in measuring emotional reflective processes, particularly an individual’s ability to monitor and manage emotions. The use of the scale has grown rapidly across different cultures, with translations into at least five languages. It has been widely used with clinical, educational, and organizational studies. Further research is needed to improve the construct and discriminant validity of the TMMS.