PG-300 is a leading-edge portable gas analyzer that offers excellent accuracy and reliability comparable in the measurement system for laboratory. In order to realize mobility and operability at high level the world’s lightest weight, enough toughness to protect against impacts by covering sheet-metal body with plastic offering a sense of unity as well as usability in the on-site measurement were pursued in design. In addition to easy-to-use graphical user interface adopted a touch screen system, thanks to connectivity to LAN or equipping a SD card slot, work efficiency inside and outside measurement site could be substantially enhanced.