How do manufactures measure rod power rating? It seems to me that every manufacture is a little different. Is there no standard guidelines as to what is a "medium" and what is a "medium-heavy"? For example: Ugly stick Tiger- 7' "Medium" 1-piece rod, 20-50 lb. test Line Weight Daiwa Saltist- 7' "Heavy" 1-piece rod, 20-40 lb. test Line Weight Why is one heavy and the other medium if they're both in the same line weight category?