Fantastic, did you go for a particular "trusted" brand or just went on vibes? How should one rationally approach shopping for a CO2 monitor for home office use?
I've tried several (Amazon Vine) and I would just leave them outside to be sure they reach 430 or so, and then take them in a closed room, also breathe on them several times and it should spike quickly. Opening up to verify an actual CO2 sensor is also a good idea. A few just had a tiny sensor and faked various readings based on this.