TemtopCO2 Monitor Portable Carbon Dioxide Meter,3-in-1 Air Quality Monitor CO2 Detector with Temperature and Humidity for Travel, Home and Grow Room

Seemed to work fine for a couple hours, then the screen went all scrambled. Recharging, turning on/off, nothing worked. Returned and got a replacement, and the second one started scrambled. Seems to me they have a serious quality control problem. Makes me wonder about the rest of their products as well.The packaging is really nice and the product itself seems solid so you get the impression it is high quality, but it simply is garbage inside and NOT a one-off problem.

Well designed and built product. Battery life is a bit short but not a big issue. I cannot evaluate the accuracy of the measurements except to say that it seems to give consistent results. The research I did on the product suggests that it gives accurate measurements compared to other products.

Seems to read co2 accurately, the battery only last 2 days tops, no alarm feature.

So I got the CO2 sensor about a month ago and today (2 days past the return period) it started displaying as shown. I'm still giving it 2 stars because it was cool and seemed well built, but the thing basically never left my desk so I'm not sure how this could have happened.I'm going to try turning it off for awhile to see if it improves, but a quick reset so far has done nothing.

It appeared to work great, when the display started to dim, then became unreadable. No damage - it wasn't dropped, didn't hit it against anything - it just went out. Waste of $50 because it lasted longer than the 1 month return window.

The screen on the first one I bought didn't work as soon as I took it out of the box. This second one worked fine for 8 months and now the screen stopped working but I am outside of the return window. I wouldn't buy one of these.

I wanted a portable, accurate, temperature, humidity and CO2 meter at a reasonable price. This is exactly that. After 3 months, the display failed but a replacement was delivered within a week of me contacting the supplier. Hence, I can recommend this unit with confidence to others.

I used this to monitor indoor air quality for CO2. It worked for about a year, now the display doesn't show anything useful. The display is showing a bunch of sections that shouldn't be on. Was good while it lasted. Now I need a new CO2 monitor. Don't buy this.