CO2 tester also has a lot of deviation, please pay attention! Took apart the bargain measuring instrument

　My name is Hu. He has not had a job since he was expelled from the corona in May last year (2020).

　I was fired in spring and found out socially, so it's the Spring Festival. At the end of the year, I was told that I was very happy when I was told that I failed in the final selection for three consecutive days at the end of the year.

　In this case, without gold, the price of AliExpress looks very attractive. I admire the failure every time, even I feel very strong, but for the formal performance in winter, I bought some boring cloth.

　Not only AliExpress, but Amazon also has a lot of products like that junk, so write with a reminder. In conclusion, full attention should be paid to the cheap CO2 measuring instrument. Although the value has improved slightly, I think the NDIR approach mentioned later is beyond reproach.

　Then, this time we tried to challenge the seller and spent three weeks patiently negotiating a refund. If you want to know the result, please read it to the end.

　Finally, the screws were removed and the results were surprisingly convincing.

　Products with the same appearance are also sold on Amazon at prices ranging from 5000 yen to 8000 yen. I hope you will be careful when buying.