Daikin Device (Suzhou) Co., Ltd., a group company of Daikin Industries, Ltd., produces compressors and control printed circuit boards for air conditioners. In the face of growing difficulties to secure human resources in China, the company is promoting the standardization and automation of manufacturing operations in order to further improve product quality. As part of these efforts, the company decided to implement major improvements in compressor airtightness testing, which had previously relied on the skill level of operators. In addition to adopting a new testing method, a motion monitoring system that visualizes the movements of the testers was developed with the cooperation of KDDI Shanghai.