Pressure Metrology Club, Mechanical Metrology Department arranged a Seminar under the topic of “The development of secondary calibration laboratory to calibrate the Dead-Weight Tester and also proposed the comparison project of Dead-Weight Tester by using the cross float method. Metrologists who gave a lecture to club member were Mr. Likit SAINOO and Dr. Tasanee PRIRUNROM. Both of them work in Pressure Laboratory, Mechanical Metrology Department. The objective of this seminar was to disseminate knowledge to their club member. The seminar was held at Phadungmat building, NIMT, Pathum Thani province.