
For dialing, you need to turn off all the electricity, otherwise you will only hear 50Hz. The first detector may have been expecting the impossible.

🌡️ Continuous Temperature Monitoring with Relative Humidity Integration
4 Review

🔍 Dioxide Controller for Digital Gas Monitoring
5 Review

🔍 Enhanced Precision with Backlit Professional Manometer for Differential Ventilation
6 Review

🌬️ Advanced 3-in-1 Indoor Air Quality Monitor with CO2/RH/Temp Data Logging and Audible Alarm - NDIR Sensor Technology
8 Review