Weytoll Carbon Dioxide Detector with Rechargeable Battery Portable CO2 Meter Tester for Carbon Dioxide Air Quality Detector CO2 Meter Monitor with Storage Case with Plastic Support Stand The carbon dioxide detector detects the carbon dioxide of the onsite environment through absorption principle of infrared light sources. The product has the characteristics of temperature, humidity, tendency chart, 999 groups of data record, 3.2" TFT full color display, alarm setting, data record of time interval measurement, real-time date and time, chargeable lithium battery, etc. Features: The application field of carbon dioxide detector is public site, agriculture, animal husbandry, industry, and more. With professional grade detection technology, this CO2 meter has stable performance, and high accuracy. 3.2-inch TFT full color display date, time, CO2, humidity, temperature(℃/℉ switchable), and other data clearly. Real time CO2 monitoring by the high precision sensor, and it will alarm you once the CO2 is exceed the setting value. Can store up to 999 groups of data, and has a chart of historical data trend for you to review. Compact size with a portable storage, easy to operate and to carry around. Rechargeable lithium battery is included, or can be powered up through 5V USB cable. Specifications: Type: Ordinary Version / Upgrade Version / Ordinary Version with Plastic Stand (Optional) Material: ABS Input: (USB) 5V, 2A Measuring Range: 0~9999PPM Resolution: 1PPM Accuracy: ±40PPM±rdg10% Temperature Measurement Range: -20~60℃(-4~140℉) Temperature Measurement Accuracy: ±1℃(±2℉) Temperature Resolution: 0.01℃/℉ Humidity Measurement Range: 0~100%RH Humidity Measurement Accuracy: ±2%RH (20~80%RH) Humidity Resolution: 0.01%RH Working Temperature Range: -10~60℃(-14~140℉) Working Humidity Range: 0~99%RH Storage Temperature Range: -40~80℃(-40~176℉) Working Current: 100~300mA Charging Time: 3 hours Power Supply: 1 * 3.7V, 2200mAh lithium battery rechargeable li-ion battery or powered by 5V USB cable Record Groups: 999 groups Screen Size: 65 * 48mm / 2.56 * 1.89in Item Size: 140 * 134 * 33mm / 5.51 * 5.28 * 1.30in Item Weight: 215g / 7.61oz Package Weight: 426g / 15.03oz Package Size: 20 * 16.5 * 4.5cm / 8.78 * 6.50 * 1.77in Package List: 1 * Detector 1 * USB Cable 1 * Storage Box 1 * Manual (English)