Testing for Dirty Electrical Power

@skyscraper 

No worries,

It wasn’t currently available on Amazon, but I did just buy one from EBay.  I’ll let you all know my results when it arrives.

jay73

The Greenwave meter starts at 3,000 hz , since we want clean power at 60 hz it's missing a lot of interference .

I have 7 Green wave filters on the circuit that my stereo is plugged into but they only filter higher frequency interference , I also use 3 PS Audio Noise Harvesters on this circuit .  When I had 5 Noise Harvesters and 2 Greenwave filters the NHs would be blinking very rapidly when the heat pump was on but now with less NHs and  more GF they blink every couple of seconds . I placed on NH in the computer outlet and another with the fridge along with a GF .  I don't use any other filters other than everything in my house is plugged into a Tripp-Lite Ultra isobar .

I might try the hifi AC iPurifier  I've read it gets warm, so I'd probably only want it plugged into power when my system is powered on.

Please see this article at inCompliance Magazine for EMC professionals: 

It is good to avoid "instant reward" measurements that produce results that mean very little.  For example, converting EMI into audio signal would work only if the high-frequency signal has modulation within audible range.  Very short spikes (microsecond-long) may or may not get converted into audio.
Make sure that you have valid numeric results - not some ambiguous relative numbers, but absolute values in mV or dBuV.  If you are committed to accuracy and relevancy of measurements, it would make sense to invest into professional tools.  There are plenty of inexpensive oscilloscopes on the market with FFT which allow you measurements of both time-domain signals and spectrum as well. I use Migsig oscilloscope STO1000 series (https://www.micsig.com/product5/)  Hantek has reasonable oscilloscopes as well. 

To connect oscilloscope to live power and not blow your oscilloscope's input use EMI Adapter: 

There is a whole field in the industry on both measurements of EMI and its mitigation with the tools and methodology that is yet to filter to audio applications...

For me the best solution was to go with power regeneration.  Nothing like having a very clean AC going to your equipment.   It is like upgrading the power supply on all your components.