Basic knowledge of boutique coffee how to grade coffee beans?

At present, there is no international standard for coffee bean quality classification, and the classification method varies from country to country, so coffee classification is carried out according to some characteristics applicable to each producing country. Take samples of coffee beans from a bag, judge them according to the standards of the producing country, rate these samples, and determine whether they are good or bad according to the evaluation. The characteristics of most coffee grades are: appearance (size, uniformity, color of beans); the number of missing beans in the sample; the quality of the cup, including taste and mellowness; and the degree of roasting of coffee beans. The classification and terminology vary from country to country, so the standard of coffee quality is only related to the type of coffee produced in that country, and it is difficult to understand the true quality of coffee if you are not familiar with a country's original classification criteria. But at least there is a fixed and unified reference between each country: the size of coffee beans is determined by a standardized sieve, so buyers do not have to look at the size of coffee beans from the producer's point of view.

A coffee bean may have a special place name, or be treated (washed or unwashed), or it may have a title, or just a letter or number after it. In some countries where the coffee industry is nationalised, the grading system seems uninteresting. In Kenya, for example, a bag of coffee might be: water-washed AA, followed by a number to indicate the quality level of the cup. However, it is this ordinary-sounding coffee that most experts agree is one of the best in the world.

Most Caribbean and Central American countries express quality in terms of altitude. For example, the eastern part of Costa Rica produces LGA (Low Grown Atlantic Atlantic low altitude), MGA (Medium Grown Atlantic Mid-Atlantic altitude) and HGA (High Grown Atlantic Atlantic High altitude); West Bank slopes produce HB (Hard Bean hard beans), MHB (Medium Hard Bean Intermediate hard beans), GHB (Good Hard Bean excellent hard beans) and SHB (Strictly Hard Bean very hard beans). Beans are hard, and the higher the altitude, the higher the price. Costa Rica's best plantations mark their bags and elevations, and like Nicaragua, Costa Rica uses the name of the region with the flavor of the country. Guatemala's elevation is relatively vague, from 700 to 1700 meters above sea level: "Good Washed" (good water washed beans), "Extra Prime Washed" (super water washed beans), "Semi Hard Bean (SH)" semi-hard beans, "Hard Bean (HB)" hard beans, "Fancy Hard Bean" super hard beans and "Stictly Hard Bean (SHB)" very hard beans.