Thornton is Leading Pure Water Analytics Thornton is Leading Pure Water Analytics A broad spectrum of products Mettler-Toledo Thornton offers meters and sensors to measure a range of parameters including resistivity, conductivity, flow, pressure, pH, ORP, temperature, dissolved oxygen, dissolved ozone, total organic carbon, and more. Mettler-Toledo Thornton serves a wide variety of industries requiring fast and accurate measurements of pure and ultrapure water. To learn how Thornton can meet the needs of your specific industry, please make a selection from the list below.