I am buying these items for our manufacturing facility so I am not an end user but if I don't hear anything I have to assume it is working as it should. Everything is good with this product.
π§ UEi Test Instruments DAFM3B Digital Multimeter
6 Review
π Enhanced Precision with Backlit Professional Manometer for Differential Ventilation
6 Review
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 Dioxide Controller for Digital Gas Monitoring
5 Review