Product review (4 stars): We purchased this meter to test apartment CO2 levels in ...
We purchased this meter to test apartment CO2 levels in Fairbanks, AK where they seal tightly for heat loss and air leaks. It worked well from the start. Seems to be consistent in it's readings. Shows lower levels when you've been off to work and that they start to climb quickly when you get home. Range seems to be 250 -1300. I feel it's worth the money so far. If you think you might have a problem spend the $130.00 and find out.