Review on 🌬️ Advanced 3-in-1 Indoor Air Quality Monitor with CO2/RH/Temp Data Logging and Audible Alarm - NDIR Sensor Technology by James Khalifa

Purchased in July 2015. It was working fine until January of this year (about half a year) and then this happened: the LCD stopped showing the bottom half of each number (although the Readings could still be deciphered (hardly - with some guesswork) but over the course of the next week the device spontaneously stopped working (hung and stopped monitoring) at frequent intervals and could only be revived with a reset. Now it barely works and only for very short periods of time. Because I need to constantly monitor the air quality around me - and most importantly, to alert me when CO2 levels are too high - to have a device that only works intermittently and maybe only 10% of the time. when it's on and its readings are barely distinguishable doesn't help me. Well I may have received an unusual defective unit but if your health depends on a monitor like this I would definitely think twice because for me $130 was down the drain and a health hazard before I realized it. didn't work. I note that Revain has taken care of the fulfillment (so you don't have to wait anymore to ship overseas, I think from China, and this might also lead to better quality control - at least for devices sold by Revain - but then again, I think you're taking a risk (financially, at least) However, if it works, then it was right.