Review on High-Quality Digital Temperature Humidity Monitor - 9999ppm by Michael Welborn

I to determine the CO2 values in the classroom/test room during psychoeducational assessments. This meter quickly displays CO2 levels after the 30-second warm-up period is complete. One star off because this model, the 7755, doesn't display the air temperature in Fahrenheit, only in Celsius. The included manual is unclear on this as it was written for more than one model. The manual says in pictures, not written, that the model gives 7752 Fahrenheit, not humidity.