I have always had difficulty translating the text and visuals of various sources concerning grind sizes of different coffee beans and roast depth characteristics. I purchase green coffee, roast it at home and more or less "guess" by trial until the results cup to my expectations. This device, of very high precision, has made measuring and recording the finished results for repeatability much easier. I don't have to take pictures and record enlargement/lighting/staging setup information for compa...