CO2 Carbon Dioxide Air Quality Monitor, Pollution & Ventilation Meter, Tester; Detect & Test Indoor Air Ventilation Levels with CO2 PPM Levels, Temperature and Humidity Sensor Readings on LED Screen

All around sturdy, compact and portable CO2 monitor for an reasonable price. Pros: 1. Measures CO2 accurate to other CO2 instruments that are calibrated in my workplace. 2. Survived multiple drop tests onto concrete and other hard surfaces and maintained functionality 3. Battery drain is minimized compared to other CO2 instruments I've worked with. 4. Changes in C02 level are measured more accurately and with an acceptable update interval. Cons: 1. Doesn't measure below 400 PPM. Might not be a problem for most folks, but I need a device that can measure all the way to zero PPM. 2. The USB connection in the back is touchy -- it doesn't actually charge the unit about half the time it's plugged in but it does maintain the display? I usually jiggle a bit and it will start charging the device again. That could be just the cable I used in the beginning as well. 3. The alarm for high CO2 goes off at 800 PPM or 1000 PPM (can't remember) but I have not found a way to silence the alarm as it increases or goes above the preset thresholds. That's a bit annoying. Conclusion: 1. I work in air quality and climate science and this is a decent CO2 monitor. The display is easy to read, not too cluttered, the reading is accurate in my experience and the price below $100 is still good value.

Typical of the low quality junk Amazon sells these days. It looks nice, and has a nice UI, and is simple to operate. It's been sitting safe on my desk for the last month as I haven't had any company over. Today I went to power it up to test it, and it turns on, beeps at me, then immediately shuts off. Save your money, buy the Aranet CO2 monitor instead.

Graphics are easy to read and understand and readings appear accurate. Experience so far has shown a seemingly short life between recharges, which for us displaces the ability to use this as a set-and-forget instrument

We keep our CO2 monitor in our den, the next room over from our kitchen. We recently received a shipment packed in dry ice. When I opened the box in the kitchen, the CO2 monitor almost immediately started beeping from the next room. It was amazing to watch how this monitor registered the levels of CO2 as it dissipated. It’s small and easy to read and use.

I don't have anything to compare the CO2 readings to but I have to believe the 1500+ reading in my living room and the 1295 in the tent with the CO2 generator can't be right. As far as temp and humidity go, it doesn't match up to other meters, the temp was at least 10 degrees too high. With the thermostat set to 66 this said it was 78 in my living room. It said outside was 47, which was the day's high and it's night time. I got this for the growing area, I want to see the CO2 generator is doing what it's supposed to, keeping the ppm close to or above 1500. The meter has an alarm turn on way before that, and there's no option to turn it off. So that's annoying. Returning ASAP.

Easy to read but buyer beware the device does not stay charged long. I usually keep it plugged into a USB port

Very accurate and easy to read.

Great product, calibrated with other measuring devices, not too bad accuracy. But the battery life is really short, unless you want quick readings, keep it plugged in. I usually keep it in one area for a longer time, so I leave it plugged in.