The 4^th China International Occupational Safety & Health Exhibition (Beijing, Nov 2008)

Visit RION Office (Tokyo, May 2008)

Visit of South China National Centre of Metrology (Guangdong, Feb 2008)

The 7th International Scientific Conference of International Occupational Hygiene Association (IOHA) (Taipei, Feb 2008)

Visit Quest Technologies Manufacturer for Service Training (Milwaukee US, Dec 2007)

Visit SENSIDYNE Manufacturer for Service Training (Florida US, Nov 2007)

America Industrial Hygiene Association (AIHA) show 2007 (Philadelphia US, Jun 2007)

AIHCE 2006 Exhibition (Chicago US, May 2006)

Visit Eco Sensors Manufacturer (New Mexico, Dec 2005)