This carbon dioxide meter from SISCO combines CO2 detection and smoke alarm in one and can be used for air quality monitoring with a detection range from 400 to 5000 ppm. In addition, it can also provide real-time temperature and humidity data, allowing for full knowledge of your surroundings. Keep in mind when you purchase the unit you have to calibrate it first. And we’re here to help you with that. In this video, we’re gonna show you how to calibrate our CO2 meter.
The monitor comes with both manual and self calibration. You're going to get more precise results if you choose to manually calibrate it. We're going to show you how to do it in a second.
First off, if the unit has been paired with WiFi, please turn off the WIFI by pressing the button three times. 
Then press the button 5 times to start the manual calibration, the buzzer beeps once, and the CO2 icon starts to blink on the screen. It takes three min to complete the calibration. 
When the calibration value reaches around 400ppm, the CO2 icon stops blinking and the buzzer beeps twice. If you want to stop, press the button during the calibration to cancel it.
https://www.youtube.com/watch?v=sd7Le2Gaa_c
Attention: please put the device nearby the ventilated place during manual calibration to ensure the accuracy of detection.
The high concentration of CO2 in the air may have interfered with your sleep or caused you to lose concentration and even get headaches sometimes at work.
With the smart CO2 detector from SISCO, you’ll know when to ventilate your room and office for fresh air. This device protects you from exposure to unhealthy levels of CO2. The round-the-clock feedback is made possible through its self-calibration CO2 indicator. Let this useful gadget to help you get a good night’s sleep and focus on your work again.
