3 in 1 Air Monitor CO2 Carbon Dioxide Detector Temperature Humidity Tester, White, 501 Original

USB 3 in 1 Air Monitor CO2 Carbon Dioxide Detector Digital Temperature and Humidity Sensor Tester Greenhouse Warehouse Air Quality Analyzer MeterFeature:1. Independent high-precision sensor, more accurate detection.2. Real-time monitoring and real-time display of carbon dioxide concentration per cubic meter.3. It can detect and display the temperature and humidity of the environment to help users understand the environment.4. It is suitable for offices, homes, gymnasiums and other occasions, with a wide range of applications.5. Intelligent color screen display, clear numbers, easy to identify and read.6. In the alarm mode, the user is reminded to pay attention to the environment by changing the color.7. It is small and portable, easy to carry, does not take up too much space, and can be installed at home.Working principle:1. The working principle of the infrared non-dispersive absorption (NDIR) gas sensor is based on the absorption characteristics of different gas molecules for the near-infrared spectrum, and the gas concentration is calculated and determined by analyzing the relationship between gas concentration and absorption intensity (Lambert-Beer law).2. Molecules composed of heterogeneous atoms such as CO2 and CO have absorption spectra in the infrared wavelength region, and their absorption intensity follows the Lambert-Beer law.3. When the light wave corresponding to the characteristic absorption wavelength of a certain gas passes through the measured gas, its intensity will be significantly weakened. The degree of intensity attenuation is related to the concentration of the gas, and the relationship between the two obeys the Lambert-Beer lawThe relationship between carbon dioxide concentration and health:Above 5000PPM: coma or even death4000-5000PPM: severe hypoxia, permanent brain damage3000-4000PPM: Jump acceleration, mild nausea2000-3000PPM: Feeling dizzy and unable to concentrate1000-2000PPM: Feel the air muddy, drowsy450-1000PPM: feel comfortable and breathe smoothly350-450PPM: The air is fresh and comfortableSpecification:Color: Black, WhiteMaterial: ABSMeasurement accuracy: 1PPMMeasuring range: 400-5000PPMPower supply: USB plug-in or use 3 AA dry batteries (not includeds)USB interface: Type-C/5VWorking voltage: 5VItem size: 137*80*35mm/5.39*3.15*1.38inNote:Due to the different monitor and light effect, the actual color of the item might be slightly different from the color showed on the pictures. Thank you!Please allow 1-2cm measuring deviation due to manual measurement.Package Content:1 X Carbon Dioxide Detector1 X USB Cable1 X Instruction