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Thanks!

I’ve had it less than a year. Still under warranty. May just take it back and get a new one sent over. I’ve unplugged and calibrated three times. Checked connections etc. It was working perfectly and then all of the sudden quit.

Anyone have one of these ? It just stopped reading CO2 levels. Has a big 0 where the ppm levels should be. Already calibrated it, again, same thing. Thanks for any help.