Feature:1. With super long range, it can detect a wide range of concentrations and can adapt to detection in various situations.2. High accuracy, its sensing is very sensitive and can accurately measure gas values.3. Multifunction, it can monitor the temperature and humidity of the environment in addition to gas detection.4. Small size, light weight and portability, can easily hold it for measurement in various situations.5. LCD digital display, its reading is clearer, and it is more convenient to record and measure data.Specification:Item Type: Gas DetectorModel: GM8802Material: ABSBattery: 3x800mAh 1.2V Ni-MH AAA Battery (Battery Included)Plug: EU Plug AC 100-240VAdapter: 5V 1000mAPurpose: Temperature and humidity monitoring of gas environmentBasic ParameterDetection GasAir CO2Test Scope0-9999ppmlowest Reading1ppmResolution1ppmError(40ppm+3%)Response Time120sSensor TypeNDIR CO2 Gas SensorWorking Environment0-50,32-122;10-85%RHStorage Environment0-50,32-122;10-85%RHHow to use:.1. Turn on and off Press the power button to turn on, long press the power button to turn off.2. After the carbon dioxide detector is turned on, the indicator light will appear in the middle of the screen until the carbon dioxide sensor starts to send out a signal, which takes about 90 ~ 120 seconds. The measured carbon dioxide concentration will be displayed on the LCD screen with 6 symbols.3. Data hold and maximum/minimum value: When the data hold/maximum/minimum key is pressed, the screen will display the HOLD mark, and the carbon dioxide concentration, air temperature, humidity and other values will be locked. Press this key again to display the screen Display the Maximum mark, which is the maximum value read. Press again, the screen will display the minimum mark, which is the minimum value read. Press it again and the screen will display the current value. When the data hold/maximum/minimum key is turned on, the instrument will repeatedly display the locked current value, maximum value, minimum value and current value.4. Time and date setting: long press the clock button to enter the clock mode, the clock will flash, press + or increase or decrease the number, press the clock button, the minutes will flash. In this way, press the clock button repeatedly and set in the order of H-M-Y-M-DY.M.D. When "Y.M.D" is flashing, press "+" or "-" to switch between "Y.M.D" and "M.D.Y", and select the desired date display format as "year-month?day" or "month-day-year". After setting, long press the clock button to exit the clock mode.5. Sound and light alarm setting: long press the alarm button, the indicator light indicates that the alarm is activated. If the displayed carbon dioxide concentration exceeds 1200ppm, the buzzer will beep intermittently (if it exceeds 2500ppm, the buzzer will beep urgently), and the red backlight will light up until the carbon dioxide concentration is normal. Short press the alarm again to cancel the alarm. By default, the alarm state is on.Package List:1 x Gas Detector3 x Ni-MH Battery1 x Power Adapter1 x EU Plug1 x Manual