Newentor CO2 Monitor, Indoor Air Quality Meters, Carbon Dioxide Detector with Voice Alert, Large Display CO2 Tester, Temperature Humidity Sensor, Alarm Clock for Home, RV, Grow Tents, Black

I used this to monitor conditions inside a mushroom growers tent. It worked flawlessly and the display was clear and colorful. For instance, the CO2 meter will change color when it surpasses a reading that you choose. At glance, you know if all is OK, or needs attention. I compared it's accuracy to other devices and found it to be very good accuracy. The best thing is the warranty coverage. After about 4-5 months inside the grow chamber with humidities in the 70% to 95% range, the lower half of the display began displaying only about half the digits. They replaced the entire unit, no questions asked. They did request me to help their engineers make the product better by sending them pictures of the missing digits/pixels. They had already replaced the product with free shipping. I was glad to help them and they thanked me. Incidentally, the failure may have been my fault for subjecting the electronics to such high humidities 24/7. The true measure of a company is revealed when there are problems. I give this company an A+++.

Great product seems to be fairly accurate as I have it in a grow area with several other humidity and temperature sensors. Screen is plenty bright but has dimming feature which is nice I guess if you want that sort of thing. For general testing I wish it updated more frequent than 6 second when plugged in, but really not a major issue. I do wish the little stand that flipped out was a bit more stable. But thats only cause mine is on a grid of thin wire, on a table or regular surface its great.I use mine in a martha tent and it works great.

I like the information displayed:- CO2, ambient room temp/humidity, time, date, alarms off/on.Alarms with snooze is a nice feature as well.I like the AAA battery (x3) backup.I like the size, wall mount option, or kickstand.Their customer support is amazing!Things I think could be improved (why maybe 4 instead of 5 stars):- The display, as shown in the attached images, is very sensitive to touch. Simply removing the protective coating caused some interesting white lines to appear in the black parts of the screen and the numbers to become temporarily discolored. Some of the larger, lighter colored, numbers do still have dark crack looking lines in some of the number segments. Lightly massaging them will make them disappear or move elsewhere. After a day or so or a few segment cycles (without touching the screen), the display looks good again.- The cord is plenty long enough, but it feels very light weight. It reminds me of the wires on the complementary headphones from the airlines. If the device was equipped with a USB-C connector instead, it would give the user more options.- If the unit was able to use a rechargeable battery, that could be charged with the USB cable, that would be a nice improvement as well.- Personally, I would like the unit better if it were all black with a white Newentor logo below the display, or all white. The black outer with the white inner frame around the dark display distracts my eye from the information displayed.

**update** Had a little trouble finding the right way to contact newentor as their social media (recommended on the packaging) was unresponsive but they did eventually respond by email (believe it was 2 days later). Once they responded though and I provided a video of the issue, they sent a replacement right away and the replacement is working properly.**prior review: ** Worked great for 2 days but now whenever I try to turn the backlight off it beeps and fully resets, even resetting the clock. Goes to medium brightness fine but turning backlight off triggers the reset

This is actually really cool information to have. You don't necessarily think of CO2 as an indoor pollutant, but levels in your house or office can climb really high. This provides interesting data to monitor, and reminds you to open a window on occasion. Airing my house out cuts my CO2 level in half, and it's neat to see that work.The device itself is very easy to set up and use, and the size is unobtrusive enough to put it anywhere. Battery back up plus a USB plug means that you don't lose data if your power flickers. Cool little device. Definitely recommend it if you're into data or just want healthier air.

I needed to calibrate this before it could be used. I thought this was no big deal but then found that I had to recalibrate it every time I removed the batteries. We use this in an RV and I don't leave batteries in any devices when the RV is not in use.Setting the alarm is an unpleasant experience. You must hold the UP arrow for a long time until it finally reaches 1800 or so. Setting it below 1800 just means you'll be waking up frequently in the cooler months when the RV is shut tight. Setting it much higher and you risk a headache.Overall it seems to perform its job but the user interface needs work.

The first unit (black) was delivered Oct. 26 2024, and has spent almost the entire time in grow chambers with 95+ humidity, there was water in the battery compartment. The second unit I've had less than a week, and as pictured they are in agreement. The small unit to the right is NIST certified so I could verify the humidity and temp with a known value. They do take some time to settle the readings even after a manual scan, just give them extra time after extreme changes. My only complaint is the max CO2 reading is 5000 ppm. I'm happy with them.

This worked fine until it didn't. Six weeks in, it does not respond to battery power at all (even with new batteries). Waste of money.