Features& 65306; * A gas detector is a device that detects the presence of gases in an area, often as part of a safety system. This type of equipment is used to detect a  gas leak and interface with a control system so a process can be automatically shut down. A gas detector can sound an alarm to operators in the  area where the leak is occurring, giving them the opportunity to leave. This type of device is important because there are many gases that can be  harmful to organic life. * Gas detectors can be used to detect combustible, flammable and toxic gases, and oxygen depletion, etc. This type of device is widely used in  industry and can be found in locations, such as on oil rigs, to monitor manufacture processes and emerging technologies such as photovoltaic.  They may also be used in firefighting. * Portable monitor for detect CO2, temperature,humidity . * Respond quickly, detect precisely, sound,light two types alarms indication. * Electrochemical principle measuring,high accuracy. * Rechargeable battery,USB powered. * Large LCD screen backlight display, can read in dark. Specifications& 65306;       Gas Type    Carbon Dioxide (CO²)        Measuring Range    350~9999PPM        Resolution    5PPM        Basic Error    +/-(30PPM+5% rdg )        Response Time    ~90 sec        Recovery Time    10 hours           Power    3.7V li-battery        Product Net Weight    170g         Product Size    181*63*30mm         Packing    ---