Yifei | Sept. 6, 2024

Rodger | May 16, 2023

Love it!

For Open CO2 Sensor

I have so many air quality sensors my wife says i'm starting a collection. the OpenCO2 Sensor made by David is by far the most fun. i'm like a kid on christmas.

David was very helpful by answering all of my pre-sale questions and he also shipped the sensor very promptly.

It says 3d printed case, but wow it's the best 3d print i've seen. very durable, smooth, and nice quality.

This device's accuracy stands toe to toe with a similar unit that costs 2.5x's the price.

Thank you David! I sent another friend your way from NC. he's gonna love it!

Response from OpenCO2 | May 17, 2023

Thank you very much for the very positive feedback! The case is 3D printed out of resin with a layer height of only 0.05mm. So, it looks like it is injection molded.

In the newest release (already on your sensor) there is also a fun little Easter egg. Just press the led button for 5+ seconds in battery mode.

Philipp | May 11, 2023

Great Sensor

For Open CO2 Sensor

Great sensor, fast shipping, very friendly and helpful contact. Interesting measurement results, especially in the bedroom.

Response from OpenCO2 | May 11, 2023

Thank you!

Alexander | March 12, 2023

What an amazing little thing that is.

For Open CO2 Sensor

What a genius little thing that is, that e-ink display is amazing, allows for super long battery life.
Super small, absolute bargain for that price and quality of sensor. Reacts quite fast on changing co2 levels.
Can only recommend, hope it will be back in store soon, will buy some for family members.
co2 values in rooms increase much faster then I thought.

Response from OpenCO2 | March 12, 2023

Thank you very much for the very positive review. I've already ordered parts for the next Series with 150 devices which should arrive in the beginning of April.

Michael | Jan. 28, 2023