2.8-inch LCD CO2 Concentration Tester Mini Carbon Dioxide Detector Humidity & Temperature Meter Air Quality Monitor 1200mAh Lithium Battery CO2 Meter

2.8-inch large screen simultaneously display the current CO2 concentration, temperature, humidity and battery indicator. 1s automatic refresh detection data, real-time monitoring, stable and reliable. 4pcs color light bar(green, yellow, orange, and red) indicate for the corresponding CO2 concentration. One button control, short press to switch the temperature unit between ℃ and ℉, long press to ON/OFF the detector. Built in with 1200mAh rechargeable lithium battery, no need