SAF Aranet4 Home: Wireless Indoor Air Quality Monitor for Office or School (CO2, Temperature, Humidity and More) Portable, Battery Powered, E-Ink Screen, App for Configuration & Data History

Love the Aranet4 CO2 monitor, but it is a bit pricy. It is super accurate, and the mobile app is top-notch. At first, I tried cheaper ones from Aliexpress, but they are just junk; their detection level was often at 2000 ppm, not sure what it is detecting, me and my wife were freaking out, and we had none of the symptoms we should have. After receiving Aranet4, it showed at 700 ppm range, which we felt was safer, and trusted the readings. It also fluctuated up and down to normal whenever we used our gas stove. Unlike the Aliexpress junk, it constantly stays high all the time.

This is afantasic little device that works well. It shows us just how much bad air is in the room, and we then open the doors and/or windows to balance it out. Lasts a long time without having to change battery. Display quality is great and easy to read, and bright enough to see in daylight.

As someone who has evidently been suffering from extremely elevated CO2 levels for about 10 years (Yes, it was horrible and I didn't know), I have to say this is a great product and has literally saved my health and well being. From what I know this product is essentially a top of the line air monitor but it comes with a pretty hefty price. While I love this product I must also include that I originally started with a much much cheaper air monitor (Qingping) which after a couple months of using them in tandem, seems to be consistently within 50ppms of the Aranet. I do not regret the purchase of the Aranet because it has more sophisticated sensors and takes readings in a fundamentally unique when compared to my Qingping which gives me added confidence in the results. I have never felt better thanks to my new ventilation fan providing me fresh air throughout the day. I literally would have never been able to resolve this issue without the use of these air monitors. For me, they were worth every penny. My only complaint with the Aranet is the physical monitor itself doesn't seem to be able to display temperature in Fahrenheit instead ofcelsius, but that's not why i bought this monitor. Great product. Hope this helps.

Every thing works as advertised on Aranet model O9C58 . Co2 tested against Inkbird monitor both within 20 ppm or less of each other. Order arrived next day. Display is bigger on Inkbird.

I think, this is an excellent monitor. The app is also easy to use and reliable. I have never seen either the device and the app to fail after few months of usage.

Eye opening to realize how some rooms build up too much CO2 - especially smaller rooms. Great in helping me investigate and figure out how to improve air flow / air movement / interchange to kids room.

If you want it, get it.This little thing will last for over a year on simple alkaline AA batteries.

Easy to setup. Small footprint and very portable. No annoying LED lights. Accurate compared with other sensors I have. Calibrated CO2 when I got it. Able to change the thresholds for green/yellow/red. Bought one for the bedroom and the temp and humidity only to monitor the attic. Bluetooth range is pretty good on “extended”.