Multi-Gas Detector 4 Gas Detects Oxygen Hydrogen Sulfide Sulfur Dioxide Lower Explosive Limit Sensor Range O2 0 to 30 Percent H2S 0 to 500 ppm SO2 0 to 150 ppm LEL 0 to 100 Percent Operating Temp Range -20 to 50 Degrees C (-4 to 122 Degrees F) Battery Life 12 hr. Display LCD Height 6-3/4 In. Width 2-1/4 In. Depth 2-5/8 In. Includes Charger