Research Findings: The purpose of this study was to refine and validate the Assessing Classroom Sociocultural Equity Scale (ACSES), an observation tool for measuring equitable sociocultural interactions in early childhood classrooms (pre-K to Grade 3) with racially minoritized learners (RMLs). Preliminary psychometric information from 142 observations across 52 teachers (average of 2 videos per teacher) provided internal consistency and validity information. Our analyses resulted in a significant and highly reliable 5-factor solution comprising 33 items. These five factors are: Challenging Status Quo Knowledge, Equitable Learning Opportunities for RMLs, Equitable Discipline, Connections to Home Life, and Personalized Learning Opportunities. (author abstract)