Negative Positive
Title: Gives lots more info than single test.
Review: Working with this unit, we've been able to get an average for warm weather when the windows are open a lot and cold weather when the house is shut. As of now, we're at about 3.4, which is below the federal guidline threshhold of 4.0. Peace of mind! The company who makes it charges about eighty bucks to re-calibrate(more than half the price of a new unti), which seems pretty steep, considering that the unit needs to be re-calibrated each year. Otherwise it gets 5 stars.
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