Two LED indicators flash to check the maximum and minimum levels of the magnetic field.
The Blue LED indicates that the field strength is +6dB (200mA/m)
The Red LED indicates tester is switched on.
The Listener can also be used as a personal listening device with the inbuilt microphone.
For a more professional Field Strength Meter try our FSM 2.0.
Price excludes VAT. Please note that individual users may qualify for VAT exemption. For more information, go to the VAT Exempt Form.