Product review (5 stars): ... to ensure levels in my home were not as bad as noted by my NETATMO unit
Purchased this CO2 meter to ensure levels in my home were not as bad as noted by my NETATMO unit, purchased also through Amazon.  (2 out of 3 NETATMO units suggested abnormally high CO2 levels in home.  They also suggested abnormal outside CO2 levels....500-650 ppm.)

Unit performs as expected.  CO2 levels are as expected.  I don't have inside air quality issues as suggested by NETATMO.  However, this experience did show a need to pay closer attention to the air quality inside our home.

L. Ellison