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.
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🔍 Klein Tools VDV501-852 Tester for Accurate Locating Abilities
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🔍 Enhanced Precision with Backlit Professional Manometer for Differential Ventilation
Digital multimeter RGK DM-12
🌡️ Continuous Temperature Monitoring with Relative Humidity Integration