Temtop C1 CO2 Monitor Air Quality Monitor, Indoor Carbon Dioxide Detector, Tester for CO2, Temperature and Humidity

I have no comparison device in order to verify if it's accurate but it seems like simple and sturdy.

I have it since a month in Eco mode and the battery is still at max.

The only downside is that the CO2 level arrow isn't gradually moving but only in 3 positions green/yellow/red, the threshold values are simple (1000 and 1500 ppm) and I can live with that.

Better than other CO2 monitors that I have had in the past.

Does what it's supposed to do, without any unnecessary extras. Air quality measurements are reliable, the design is slick and after 2 weeks of using it in different modes the battery is still full. Absolutely satisfied with my purchase, can only recommend.

After being given the opportunity to compare the Temptop C1 with an Aranet 4, I was very impressed with the accuracy of the Temtop monitor. Readings are generally within ±5% of the Aranet 4, which is great given that the C1 is only fraction of the cost. The biggest downside is that there is no way to extract historical CO2 data from the C1, although this is acceptable given the price. The battery life is another upside - I have had it on performance mode for over a month and have not yet had to charge it.

Within 5 minutes out of the box it was calibrated and ready to go, set up in the kitchen. Took me a while to realize that the mystery beep every so often was coming from the meter as it updated the CO2 measurement! Interesting to see how the level varies whenever I cook with gas - I'm sure the plants on my kitchen windowsill appreciate the extra supply of life-giving trace gas!!