1.Sensors use imported sensitive elements, which have the characteristics of high accuracy, strong interchangeability and high reliability. 2.The internal machine core is in the form of components. Maintenancecan be accomplished only by replacing components. 3.Independent liquid crystal display and acousto-optic alarm module, long life, can show the gas concentration working state on state on site and sound-light alarm. Infrared remote control technology, easy operation of zero calibration., Manufacturer: DRAUXI