GT-40 Multi-Function Gas Detector Kit for CH4 and CO gas detection. Methane (CH4), Range 0 to 10,000ppm & 0-100% LEL or Volume. Carbon Monoxide (CO), Range 0 to 2,000ppm. Highly visible flashing LEDs on display panel. 80dBA Sounder, typically 85 dBA @12 in. ATEX/IEC Certification: Ex ia d IIB T3. CSA Certification: Class 1, Groups CD T3. GT-40 comes supplied in Carrying Case with Solid End Probe, Tygon Tubing, Hydrophobic Filter (Pack of 2), Wrist ...