Manual coffee grinder usually has multiple gears, and different gears can adjust the thickness of ground coffee beans, thus affecting the taste and brewing time of coffee.

Generally speaking, the finely ground soybean flour is suitable for soaking and brewing (such as French filter press pot or manual pot), and the coarsely ground soybean flour is suitable for drip filtration and brewing (such as drip filtration coffee machine). If you like the rich taste of coffee, you can try to use finely ground soybean powder, if you like the light taste, you can try to use coarse ground soybean powder.

To sum up, choosing the gear of manual coffee grinder depends on personal taste, brewing method and roasting degree of coffee beans. It is suggested to try and adjust according to your own preferences and actual situation to find the most suitable thickness of ground soybean powder.