Feature: 1. CO2 detector, can store 80,000 sets of data, and carbon dioxide concentration, temperature and humidity can be checked at any time. 2. Support data recording, adjustable recording start and end time, and recording interval (hour‑minute‑second). 3. The image trend can more intuitively observe the trend change of carbon dioxide in different periods. 4. It can be connected to WiFi and can be monitored online and detected at any time through APP. 5. With audiovisual alarm, can set CO2 alarm value. If concentration exceeds set value, the tester will sound and change the brightness. 6. Support the measurement of carbon dioxide concentration, temperature, humidity, dew point temperature, wet bulb temperature, time, date, etc. Specification: Item Type: Carbon Dioxide Tester Material: ABS Model: ST8310A Display: 2.8in FPC Screen True Color CO2 Carbon Dioxide: 0-20000ppm Resolution: 1ppm Accuracy: 0-10000ppm (±50ppm±3% of Reading) 10000 -20000ppm (±200ppm±10% of Reading) CO2 Concentration Test Range: 0-2,000% Resolution: 0.001% Accuracy: 0-1,000% (±0.005%±3% of Reading) 1,000%-2,000% (±0.02%±10% of Reading) Temperature ℃/℉: -20℃-125℃, -4℉-257℉ Resolution: 0.1℃, 0.1℉ Accuracy: ±1℃, ±2℉ Humidity: 0-100%RH Resolution: 1%RH Accuracy: ±5% Dew Point Temperature: -20℃-60℃, -4℉-140℉ Resolution: 0.1℃, 0.1℉ Accuracy: ±1℃, ±2℉ Wet Bulb Temperature: -5℃-60℃, 23℉-140℉ Resolution: 0.1℃, 0.1℉ Accuracy: ±1℃, ±2℉ Data Record Volume: 80,000 Groups (One page is one group) Language: Chinese/English Power Supply: Built-In 1500mA/H 18650 Rechargeable Battery, DC 3.7V (With protection board) Use Environment: Temperature Range: 0-50℃ Humidity Range: 0-90%RH Air Pressure Conditions: Standard Atmospheric Pressure Connect WiFi detection: For IOS phone in the store, search for APP to download and install For Android phone search in the application market for APP download. Package List: 1 x Carbon Dioxide Tester1 x Adapter1 x USB Cable1 x Manual