Training Section, Policy and Strategy Department arranged a training under the topic “The Calibration of Standard Weight According to OIML R 111-1 and Large Weight” gave a lecture by Mr.Wirun LAOPORNPICHAYANUWAT, Metrologist from Mass Laboratory, Mechanical Metrology Department to participants from both government and industrial sectors. The objective was to enhance the participants to identify the meaning of mass, weight, apparent mass and be able to understand the requirement of the convention mass metrology and technical standards of weights according to OIML R 111-1. Be able to choose the correct equipment to be used and do the maintenance for both standard weight and electric scales. The training was held at Administration building, NIMT, Pathum Thani province.