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The Sewerin EX-TEC HS 680 is both a CH4 (methane) detector and LEL & Ex-Tox warning system. The HS 680 basic system detects CH4 and CO2. Optional C2H6 (ethane), O2, H2S and CO are available. Made in Germany. Available: AL/FL/GA/KY/MS/NC/SC/TN-USA.