I bought an Extech CO210 CO2/Temp/Humidity datalogger about ten years ago. It's been a very useful, reliable device. Maybe there are newer models or different manufacturers (e.g. the Aranet 4) that make ones that would work for your application case. I didn't just want the readout, I wanted datalogging, and back then it was way more expensive to do datalogging than to just have a readout.
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