It is a high-quality air quality detector, using a superior electrochemical detection module, high precision, stable performance, and can accurately detect carbon dioxide values. Large screen design, measurement data is clear at a glance. Different colors show different air quality, the first smiley face is 400-799ppm, the second smiley face is 800-1199ppm, the third smiley face is 1200-1599ppm, the fourth smiley face is 1600-1999ppm, and the fifth smiley face is above 2000ppm. you may try it.

Features:
The smart carbon dioxide value tester uses infrared sensors to monitor the temperature and humidity of CO2 gas.
The superior electrochemical detection module is adopted, with high precision and stable performance, which can accurately detect the carbon dioxide value.
Strong anti-interference ability, low consumption and long service life.
Hundreds of ventilation holes on the back of the case not only accelerate the convection between the air and the machine for effective detection, but also provide good heat dissipation.
Widely used: agricultural planting, greenhouse vegetables, production warehouse, material processing, home interior, etc.
3 in 1: Large screen displays power, CO2 value, temperature and humidity.

Product Features 
√The product screen is protected by Thai
√ No need to calibrate when booting up, work automatically and detect automatically
√ Some models of sensors work intermittently. Does not affect the product itself

Operation guide
1. Press and hold the “on” button on the back for 3 seconds to turn it on and off to display the current air quality parameters.
2. The screen displays real carbon dioxide data, ambient temperature and humidity data, and the expression will change according to the change of carbon dioxide content.
3. Double-click the switch to switch between Celsius and China degrees.
4. Can be charged by plugging in a USB-Typec 5V power supply. The battery icon flashes when charging, and stops when fully charged.
If the display is full but still flashing, it means the charge is not saturated. please wait a moment.
5. This product has its own charging and discharging protection, and supports long-term use of USB power supply.

CO2 measurement method: NDIR infrared sensor
CO2 detection range: 400-5000 PPM
CO2 detection sensitivity: 1PPM
Temperature measurement range: 0~50°C
Temperature measurement accuracy: ±1°C
Humidity measurement range: 0%~99%RH
Humidity measurement accuracy: ±5%RH
Charging method: USB-Type C 5VIA
Battery: built-in lithium battery 1200mAh
Shell material: zinc alloy + ABS plastic
Net weight: about 280g

Product List: 
Carbon dioxide detector host *1
Instruction Manual*1
USB power cable*1