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MODEL LTX312 case Type 304 stainless Steel dimensions 4.75" x 2.75" x 1.65" (121mm x 71mm x 42mm) weight 20.4 oz (578g) sensor Combustible Gases/ Methane - Catalytic Diffusion Oxygen and Toxic Gases- Electrochemical measuring ranges Combustible Gases-50 ppm to 100% LEL (over-range protecred) Methane-0 to 5% of volume in 0.1% increments(over-range protected) Oxygen- 0 to 30% of volume in 0.1% increments(over-range protected) Ammonia- 0to 100ppm increments Carbon Monoxide,Hydrogen Chloride, Hydrogen Chlorine, Chlorine,Nitrogen Dioxide,Sulfur Dioxide-0.2to99.9ppm in 0.1ppm increments power source Rechargeable NI-Cad Battery Pack (9hours typical) Rechargeable Cell Lithium Battery pack (18hours typical) Rechargeable 9-volt Alkaline Battery Pack (11hours typical) temperature range -4¢µto122¢µ(-20t¡Éo50¡É) humidity range 0to99%RH(non-condensing)