à¤Ã×èͧµÃǨ¨Ñºá¡çÊ MULTI-GAS DETECTOR O2 , LEL , CO , H2S Gas Detector The QRAE II is a full-featured, compact, one- to four-sensor gas detector for oxygen, combustibles, hydrogen sulfide, carbon monoxide or sulfur dioxide. Key features include easy-to-change battery pack, a water-resistant case and a new state-of-the-art O2 sensor. Key Features Patented SPE O2™ Oxygen sensor unique features: Lead-free design that complies with RoHS directive Extended life compared to lead-type electrochemical oxygen sensors, resulting in a low cost of ownership Leak-free design, minimizing downtime Best EMI/RFI immunity technology for products in its class, eliminating radio interference Easy access to pump, sensors, filter and battery compartment without exposing electronic components to potential damage IP-65 water- and dust-resistant case Strong, protective, concussion-proof design