Battery doesn't fit properly on the sensor - you can't close the lid once it's installed. The audio is very weak and barely audible even with clips. I can send it back for a replacement, but with two different defective children I don't have much hope that the replacement isn't junk either.
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§ UEi Test Instruments DAFM3B Digital Multimeter
6 Review
Portable Handheld Manometer π for Accurate Pressure Differential Measurement
5 Review
π Dioxide Controller for Digital Gas Monitoring
5 Review