Obviously not calibrated as even in a very quiet room with no conversations the settings jump around in the 40-50 decibel range. It was a big waste of money.
π¬οΈ Advanced 3-in-1 Indoor Air Quality Monitor with CO2/RH/Temp Data Logging and Audible Alarm - NDIR Sensor Technology
8 Review
π Enhanced Precision with Backlit Professional Manometer for Differential Ventilation
6 Review
π Dioxide Controller for Digital Gas Monitoring
5 Review
π§ UEi Test Instruments DAFM3B Digital Multimeter
6 Review