I use the Enteq as a general sniffer. I then plug it into a conditioner to see how quiet it is relative to the noise. In my observations the Puritan 156 is quieter than the Furman reference 15i.
How noisy is my line? Audio Prism Noise Sniffer
A friend and audio journalist had this Prism device, and he plugged it into various outlets when I visited him. It gave a clear sense of which outlets were noisy and how effectively his conditioners were helping with noise.
He said these were not made any longer. Does anyone know of another tool like this?
It seems like it could save someone with clean power (or a quiet outlet) a lot of money from conditioners/regenerators which would not necessarily help.