In the preparation of premix, how to ensure that the dosage in the actual operation process is consistent with the formulation requirements?

In the preparation of premix: 1. How to ensure that the dosage in the actual operation process is consistent with the formulation requirements? To say the least, it is required to reduce a little, and the error between the actual operation dosage and the formula is the smallest. 2. How to better monitor the preparation process-- just weigh it as required-- you can make a whiteboard, write the recipe on it, and weigh one stroke at a time. Write according to the correct character.