Posted by Marc Martin on Sep 20, 2015; 7:53pm
URL: https://www.es-forum.com/Any-Experience-with-Smart-Water-Meters-tp4028230p4028242.html

On September 20, "Cured of EHS [via ES]" <[hidden email]> wrote:
> Longitudinal waves that Charles mentioned? What equipment measures them?

I don't know if there is a meter for that... Charles would know.  :-)

Marc