Co Combustible Gas Carbon Monoxide Monitor H2S Oxygen Hydrothion New 4 IN1. Detection of gas: 0xygen/Hydrothion/. H2S:0`500PPM. Carbon monoxide/Combustible. Resolution: Combustible Gas:0~100%LEL. To alarm: Acoustic,optical double alarm,can set thealarm value,an alarm sound isdivided into 80dB.
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