Temtop CO2 Monitor Indoor air Quality Monitor Portable CO2 Meter, CO2, Temperature, Humidity Home, Office or School

It is a genuine product. It actually uses Swiss sensors which actually measures the CO2 level unlike cheaper versions, which only pretty predict CO2 level based on other chemicals. However, the major drawback of this product is it takes around 4 to 5 minutes for this device to get the accurate CO2 level data. It is a very slow device.

Fraud. Do not order. Item does work

I was sceptical at first, but wow! the battery last for ages and the item is super accurate. great value for money and super portable. the stand is magnetic so it can be folded up and taken home in a small bag if you don't want the cleaner to run off with it :)

good item

Preciso, reattivo e batteria durevole

買ってよかったのは、部屋の二酸化炭素濃度が濃くなると、急に眠くなるとか、頭がぼうっとしたりとかの原因になることに気づかされたことだ。測定値が1500ppm近くなると、意識が薄れるのを感じるので、部屋の換気が習慣になった。閉めきった部屋で、眠くなったから、デスクにつっぷして寝るなんてことは危険だとわかった。多分、脳細胞の健康に影響してる（と思う）。 それと、メーカーによっては測定値がいいかげんな製品もあるようなので、これがおすすめです。

Works well. Portable and reliable CO2 measurement. Showed I needed more fresh air in the bedroom at night since otherwise 2100ppm CO2 with door and window closed, and also working in home office, I need to air the room for 10 minutes every couple of hours when the reading reaches 1300ppm. It has an internal rechargeable battery, USB-C rechargeable. I have been using it for 2 weeks now and have not charged it all yet! It takes approx. 1 minute to react to increased CO2 and 5 minutes to react to a reduced level. I turned off the alarm feature as that would be irritating at night. When outside it reads 450ppm, breathing directly on it gives 5000ppm.