What instrument would you use to messier the mass of flour between 100 and 1000g?

You wouldn't use an instrument to "messier" the mass of flour. "Messy" implies a state of disorder or disarray. You might use a scale to accurately measure the mass of flour between 100 and 1000g.

Here are some possible scenarios and why the question might be phrased this way:

* Misunderstanding of the word "messier": Perhaps the question was meant to ask about measuring the mass of flour.

* "Messier" as a metaphor: Maybe the question is asking about a way to make the flour less uniform or more difficult to work with. In this case, you might:

* Add ingredients: Adding other ingredients like water, eggs, or sugar would change the consistency of the flour, making it more difficult to handle.

* Roughly mix it: If you were to stir the flour vigorously, without a specific goal in mind, it would likely become less consistent and more "messy".

Please clarify the context of the question so I can give you a more accurate answer.