INKBIRDPLUS Portable CO2 Detector Mini Indoor CO2 Monitor NDIR Sensor with Full Color LCD Indicator Light Alarm Auto Calibration for Home Office Travel

I am attaching the picture of the Inkbird PTH-10C along with my one year old QingPing AirMonitor Lite. The readings from QingPing AirMonitor Lite are instant and are pretty accurate but I got the wrong readings upon unboxing from inkbird, then I did a 200 sec manual calibration and it started giving correct readings. Max difference between both the instruments is between 25 ~ 30ppm. But the Inkbird (left) needs calibration, and QingPing(right) is much faster in detection and does not need 200sec calibration like Inkbird and it auto calibrates and you wont even in know, its that fast. Inkbird is still very good because of the battery backup, accurate readings post calibration, its not great because its not fast and needs calibration every month. But for the price its a no Brainer. And as per breathefreshair forum review it gives closer readings to aranet.

had to return as faulty. Replacement working fine. Instructions manual has text size too small to read, had to photograph it and zoom in on computer to read

It is a bit smaller than it appears in the photos. Comes with a small detachable lanyard, and USB charging cable. Compact. In these initial days, it shows the measures accurately, and beeps when the levels exceed a certain threshold. Many places have far higher CO2 levels than one would think -Stores, Salons, Restaurants, etc. I carry it regularly, helps me to know which places to avoid, or be careful in, because of Air Quality. Build quality feels strong and solid. A necessary purchase, I would say. The digital interface is extremely easy to understand, and the beeping is an additional indicator of poor air quality.

Quite accurate readings. Very durable and easy to carry. The battery life is adequate, lasts about 10 hrs even after a year of use. One small negative about this product is that you cannot adjust the alarm volume which shouldn't be a problem for most people.

Very bad quality. Dead in few days.

Since this pollution in delhi & being stuck indoors with just the air purifier. I got this to see if removal of pm2.5 is enough or is there another toxic gas present. Turns out when you are sitting trapped indoors and specially when sleeping in room with the doors shut. You definitely need this to stay fresh. Normally till 1100 lvls I'm good. But turns out in a closed bedroom with 2 ppl, the co2 rises to 2000+. Either ventilate room with a small opening, keep the bedroom door open while sleeping or just keep lots of air purifying plants in the bedroom. I did a test in a room where I have just 3 plants overnight. The co2 came down from 575 to 450. So you really gotta keep a lot of plants to reduce co2. When indoors and using air purifier, just ventilate the house once or twice a day to keep air fresh. High co2 lvls will make you drowsy and lethargic. Keep a check. Also I tried in several cafes across Delhi and outdoors too. You can see how bad the ventilation is at indoor places. Don't panic. Just keep a check. Btw first charge lasted 2 full days of battery backup. Has an auto dim feature.

Ok

Useful and convenient instrument, especially in winter season, when one tends to stay indoors for long hours with restricted air flow. Also useful during long drives.