Blueprint Controllers CO2 Monitor, BCM

It's perfect for what I needed and is of very high quality. It has a few features that are great and once I got used to the settings and calibration its appears to be very accurate. I can literally breathe on this thing and it goes way up. I live in a small house and first turned it on in my living room and the ppm was 1500 just from my dog and I. I don't give it 5 stars because of the short cord and no ability to hang it on a wall which is what I had originally planned but don't let that stop you from buying. I have a few blueprint products and they all work awesome and are high quality. My local grow store only carries blueprint products but sadly had no co2 monitors. It's to bad it didn't hook to wifi so I could check ppm on my phone without having to go into the room but I'm getting off topic. Buy this and you won't regret it I promise.

Good for home