Testing Engineers, Incorporated (TEI) is an employee-owned, Top 500 Engineering firm that specializes in Special Inspection, Materials Testing, Consulting Engineering and NDT assessments. TEI has provided professional services and proven technical competence at a minimal cost. We're located throughout California and the Western States. Other services include laboratory & field testing, non-destructive testing, construction inspection, consulting engineering, failure analysis, metallurgy, roofing & waterproofing, research, soils & asphalt testing & inspection services