... Used for testing indoor gas leak leakage concentrations reach concentrations, when the alarm set out, sound-light alarm detector, and the launch ... safety products, and applicable to NG, LPG, and MG.· Can effectively avoid gas leak caused by the explosion, fire, suffocation ... -off valve.Specifications· Detect principle:semiconductor· Detected gasNG,LPG,MG· alarm concentration:NG:4%LEL±3%LELLPG:7%LEL±3% ...