I believe your Hum Detector will go of the scale at my house here in 
Auckland New Zealand
I can literally feel the hum on the side of my head inside and outside of 
my home and in my neighborhood  

On Thursday, November 19, 2015 at 4:08:15 AM UTC+13, John Dawes wrote:
>
> Using the Simple Hum Detector to determine the point when the energy of 
> the vibrating spring is equal to the energy of the Hum, it is possible to 
> measure the energy of the Hum.
>
> For the following measurement the mass of the vibrating spring was 3.5 E-4 
> kgm.
> The period of vibration was .02 seconds.
> The displacement when the spring and Hum were equal was 5 E-5 Metres  
>
> From these three dimensions the energy of the spring can be calculated as  
> 5 E-9 Joules or 2.5 E-7 Watts
> Using half the area of the spring this equates to !.25 E-3 Watts/sq Metre
>
> Allan Frey measured the threshold of micro wave hearing as 3 E-4 Watts /sq 
> Metre.
>
>
>
>

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