Exactly, so if you are running a meter on the Hanna scale and my meter was designed to use the Truncheon scale we have to find a way to normalize our values so we are talking apples to apples. We can do that by always reporting values in EC or by somehow communicating the conversion factor of our respective meters.
I guess I don't follow. I thought that if my meter told me that my solution had 1000 ppm, then it had 1000 ppm (within accuracy tolerances). If I used my micrometer to measure the thickness of a item and if I told you the thickness in millionths of an inch, than if you measured it with your micrometer, it should be the same. I shouldn't have to tell you that my micrometer is a Starett, only that the measurement is whatever.