Why should you buy a coffee grinder ?
You should  buy  coffee new roasted  , powder coffee can not use long time , easily maintained beans and keep the scent fresh . The coffee shop can grind coffee to guests upon request , but are best advised clients should have a coffee grinder , the new coffee grind coffee beans done to unleash the flavor aromatic coffee . So time is the best coffee grinder before brewing coffee . The coffee grinder grind various modes of different size . First you should learn about your coffee grinder to grind mode accordingly. If the beans are too big grind , the coffee will not have scent , bland and tasteless , if the grind is too small to have a bitter taste , coffee pulping prone to oxidation and off-flavors . So you should buy coffee grinder , grind each time should not be too much grind , grind enough phase 1 or 2 times .

Note: The beans contain fats , coffee grinder after you brush , brush , wipe the inside ( no wash by water  ) , if for long days old will smell , affect flavor of the coffee after grinding times .