| Brand | Unbranded |
|---|---|
| Marke | Markenlos |
Check the listing for details. DC 5V 0.01-9999HZ Adjustable Frequency Schumann Wave Sine Wave signal Generator. Condition: New. Listed at 15.02 USD. It effectively regulates the “field.”. The frequency oscilloscope can detect frequencies. The device features a 3.5mm external audio jack for connecting headphones or speakers. Different frequencies produce distinct beeping sounds—the higher the frequency, the sharper the sound.