Feature:1. Professional CO2 Monitor -- Versatile carbon dioxide detector can detect CO2, temperature and humidity. This air quality monitor adopt advanced ARM core chip with high stable and accuracy. It\u0027s detection accuracy up ±(50ppm+3% reading).2. Audio and Visual Alarm -- As the CO2 concentration is over setting value the CO2 tester will ring and change ligh to reminding you.3. 2.8inch True Color Screen -- Large clear FPC true-color display screen simultaneously display CO2 concentration, temperature and humidity, date and time. Special designed with 6 colorful section to indicator the CO2 concentration range, easy to know the air qaulity just for a glance.4. Data Logger -- Customizable recording start and finish time, also include recording interval (hour-minute-seconds). Built-in storage for continuous data logging, you can track trend data up 80000 groups data for co2 concentrations, temperature, humidity.5. USB Rechargeable --- This model now has a rechargeable 1500mAh lithium battery battery. You can press \"LIGHT\" button to turn off the monitoring and it will keep testing, and can carry on 24 hours uninterrupted monitoring to air quality if you plug into adapter to charge it. It will always take care of your breathing.Specification:Multifunction carbon dioxide monitor, provide high accuracy and high stable real time CO2 concentration data, and also display temperature, humidity, dew TEMPM, Wet Bulb TEMPM, and current time and data. 80000 groups history logging function allow you to do detail analyse. Fully Customizable Setting for easy and covenient use, with Audible and light alarm.Features:Professional CO2 Monitor -- Versatile carbon dioxide detector can detect CO2, temperature and humidity. This air quality monitor adopt advanced ARM core chip with high stable and accuracy. It's detection accuracy up ±(50ppm+3% reading).Audio and Visual Alarm -- As the CO2 concentration is over setting value the CO2 tester will ring and change ligh to reminding you.2.8inch True Color Screen -- Large clear FPC true-color display screen simultaneously display CO2 concentration, temperature and humidity, date and time. Special designed with 6 colorful section to indicator the CO2 concentration range, easy to know the air qaulity just for a glance.Data Logger -- Customizable recording start and finish time, also include recording interval (hour-minute-seconds). Built-in storage for continuous data logging, you can track trend data up 80000 groups data for co2 concentrations, temperature, humidity.USB Rechargeable --- This model now has a rechargeable 1500mAh lithium battery battery. You can press "LIGHT" button to turn off the monitoring and it will keep testing, and can carry on 24 hours uninterrupted monitoring to air quality if you plug into adapter to charge it. It will always take care of your breathing.NOTE: use computer download analysis recording data please download computer software via the U disk.Specification:Model: ST8310AProduct Name: CO2 TesterColor: WhiteDisplay: 2.8in FPC true color screenCO2 Testing Range: 0-20000ppmResolution: 1ppmAccuracy: 0-10000ppm (±50ppm ±3% of readings) 10000-20000ppm (±200ppm ±10% of readings)CO2 Concentration Testing Range: 0-2.000%Resolution: 0.001%Accuracy: 0-1.000% (±0.005% ±3% of readings) 1.000%-2.000% (±0.020% ±10% of readings)Date Storage Capacity: Max. 80000 groupsSampling Rate: CustomizableAlarm Mode: Audible Light Alarm( Green/Yellow/Red )Alarm Value: CustomizableRechargeable Battery: 3.7V 1500mAhUSB Input: DC 5VTemperature: -20℃ - 125℃ ( -4℉ - 257℉)Unit: ℃/℉ SwitcheableHumidity: 0-100% RHDew Temp: -20℃ - 60℃ ( -4℉ - 140℉)Wet Bulb Temp: -5℃ - 60℃ ( 23℉ - 140℉)Item Size: 146 * 80 * 68mm/5.7 * 3.1 * 2.7inItem Weight: 211g/7.4ozPacking List:1 *Carbon Dioxide Detector1 * Power Adapter1 * USB Cable1 * U Disk1 * User ManualPackage List:1 *Carbon Dioxide Detector1 * Power Adapter1 * USB Cable1 * U Disk1 * User Manual