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I’ve recently bought a hydro farm c02 meter for my grow tent. My grow tent is in my unfinished basement and I’m getting readings that range from 1000-1500 ppm (which should be a good range) without supplement. I have recalibrated multiple times to be sure, but every time I check, its in those ranges, I do it at random to be sure it’s not from my huffing and puffing. Just curious, wondering why such high ppm and hoping there’s not a serious issue I’m not realizing, tia guys