Point +: lcd screen very useful for very readable test.
Professional I still wonder? Useful I admit but it is a tool once or twice. But design a chi ... beautiful cardboard box by cons :) (Note of course in marssiens) But if good sender ... Copy french :)
In short, for a product that not use every day, it is a big investment. Are really profitable? redneck. Customers are not going to charge for testing Ethernet cables ...
