JCSS (Japan Calibration Service System) is a traceability system based on the Measurement Law of Japan. More than 90 types of JCSS reference materials are subject to the reference material development plan formulated by the Ministry of Economy, Trade and Industry of Japan. It is developed from time to time and used as a reference material for various official methods in Japan. JCSS are reference materials that ensure traceability to specific reference materials, managed by CERI (Chemicals Evaluation and Research Institute, Japan), a designated calibration institute under the Measurement Law of Japan. Fujifilm Wako provides JCSS reference materials such as inorganic standard solutions (ion/metal standard solutions), organic standard solutions, and pH standard solutions.