Areas of Use and Limitations of the edge sharpness testers

[EOU]

Thanks to KnifeGrinders and Me2 for breathing some life into an older thread. It is just as important to us that our customers understand what our instrumentation will do as opposed to what it won't. Both of you are correct in describing, accurately, what both sides of that coin look like. We're big on analogies here and this is a favorite that we've used before; we think of our instrumentation as we do a thermometer. Is temperature the sole determinate in whether we feel comfortable outdoors or not?  How about wind velocity, humidity, and is the sun shining or not? Will we be playing tennis or just sitting on the porch swing? All of these factors contribute to our decision to grab a jacket on the way out the door or not. Same with knives and knife sharpening, plenty of factors to consider before we select or sharpen an edge and thank goodness for that. If one size fit all we wouldn't have much to talk about would we?