Ordered this for my basement brewery to warn me about CO2 leaks. Temperature read 10F too high for the first few hours, perhaps due to heat generated while charging the battery? In any case, it seems accurate (+/- 1F) now. The CO2 sensor is quite sensitive and seems plenty accurate for my application. It is sensitive enough to detect the CO2 level rising if you stand near it for a couple of minutes and I was surprised how much higher (from ~460 ppm to 650ppm) the concentration rose while I was cooking dinner last night. To test the alarm function I rigged up a one gallon jug, some random tubing and gas connectors, and a syringe of C02. Adding 7-8 milliliters of C02 to the one gallon jug (initially at ~460ppm) bumped the CO2 concentration inside to ~2400ppm, which is well within the margin of error for this setup (one ml CO2 should raise the CO2 concentration of one gallon of air by ~260ppm).

Happy to add this to the other Inkbird products in my brewery.

Addendum:
I have had this now for several days in my (basement) brewery. After venting the CO2 in my pressurized conical fermenter, it was nice to be able to check that the CO2 level was still well within the safe level (~600ppm) and then returned to normal within a few hours. Very happy with the purchase.