Features:  The cover is made of ABS material, has the characteristics of splash proof, dustproof and explosion proof, give you a better using experience.  2 inch LCD display screen, and with the two types of automatic light and brighter light, can be used in different environments.  Three alarm modes: light alarm, vib-ration alarm and bu-zzer sound alarm, it can better remind you when the value reaches the warning value.  4 in 1 gases detector: This tool can detect O2, H2S, CO and LEL for you, four gases can be measured with this one instrument, no need to purchase separately or repeatedly, saving you money.  Multiple uses: This gases detector is suitable for gases transmission and distribution process detection, gases station detection, pipeline detection, use in the pharmaceutical and chemical industries, and so on.  With data storage function, it can store up to 500 alarm data.    Specifications:  Material: ABS  Voltage: 110~240V  Plug: EUplug, USA plug (optional)  Measuring ranges:  Combustible gases: 0~100%LEL  O2: 0~30%vol  CO: 0~1000ppm  H2S: 0~100ppm  Resolution:  Combustible gases: 1%LEL  O2: 0.1%vol  CO: 1ppm  H2S: 1ppm  Low alarm:  Combustible gases: 20%LEL  O2: 19.5%vol  CO: 50ppm  H2S: 10ppm  High alarm:  Combustible gases: 50%LEL  O2: 23.5%vol  CO: 150ppm  H2S: 35ppm  Explosion proof mark: Exib IIB T-3 Gb  Working temperature: -10~50& 8451;  Proof level: IP65  Battery: 1 * lithium battery, 1800mAh (included)  Item size: 130 * 67 * 30mm / 5.1 * 2.6 * 1.2in  Package size: 220 * 170 * 70mm / 8.7 * 6.7 * 2.8in  Package weight: 800g / 1.8lb    Packing list:  1 * Gases Monitor  1 * User Manual  1 * Power Adapter (Optional)  1 * USB Cable  1 * Aluminum Box  1 * Nut