Portable Carbon Dioxide Detector Useful CO2 Meter Humidity Temperature Tester ℃/℉ Switchable Air Quality Monitor with Storage Case The carbon dioxide detector detects the carbon dioxide of the onsite environment through absorption principle of light sources. The product has the characteristics of temperature, humidity, tendency chart, 999 groups of data record, 3.2" TFT display, with alarm setting, data record of time interval measurement, real-time date and time display, chargeable lithium battery or separate external USB charging, use life of sensor ≥8000 hours and stable data. Features: 3.2-inch TFT display date, time, CO2, humidity, temperature(℃/℉ switchable). Also can display test mode, historical trend, alarm value setting, records, setting, calibration, data clear and etc.. Real time CO2 monitoring by the high accuracy sensor, and it will alarm you once the detecting data is exceed the setting value, and you can press "enter" button to open/close the alarm sound. Backlight brightness adjustable, totally 4 gears for you to adjust. Support close auto shutdown function, or set 15min, 30min, 45min,1h, 2h, 4h, 8h auto shutdown time. Equipped with reset function, after reset all the parameters will be restored to factory parameters. Can store up to 999 groups of data, and has a chart of historical data trend for you to review. Compact and portable, easy to operate and to carry around with you. Comes with 3.7V, 2200mAh rechargeable lithium battery, or can be powered up through 5V USB cable. With professional grade detection technology, this CO2 meter has stable performance, and high accuracy. Suitable for public site, agriculture, animal husbandry, industry, and more. Don't operate or calibrate the equipment parameters at will to prevents error in data detection or inaccuracy. Specifications: Name: Carbon Dioxide Detector Material: ABS Input: (USB) 5V, 2A or lithium battery battery Measuring Scope: 0-9999PPM Resolution: 1PPM Accuracy: ±10% of readings ±40PPM Working Temperature Range: -10℃ to +60℃(-14℉ to 140℉) Working Humidity Range: 0-99%RH Storage Temperature Range: -40℃ to +80℃(-40℉ to 176℉) Temperature Measurement Range: -20℃ to +60℃(-4℉ to 140℉) Temperature Measurement Accuracy: ±1℃(±2℉) Temperature Resolution: 0.01℃/℉ Humidity Measurement Range: 0-100%RH Humidity Measurement Accuracy: ±2%RH Humidity Resolution: 0.01%RH Power Supply: 1 * 3.7V, 2200mAh lithium battery rechargeable li-ion battery or powered by 5V USB cable(both included) Working Current: 100-300mA Charging Time: 3 hours Record Groups: 999 groups Screen Size: 66 * 50mm / 2.60 * 1.97in Item Size: 140 * 98 * 30mm / 5.51 * 3.86 * 1.18in Storage Box Size: 252 * 210 * 70mm / 9.92 * 8.27 * 2.76in Item Weight: 265g / 9.35ounce Package Size: 255 * 75 * 120mm / 10.04 * 2.95 * 4.72in Package Weight: 668g / 1.47lb Packing List: 1 * Detector 1 * USB Cable 1 * Storage Box 1 * Manual (English)