You can perform research to find the typical moisture content values for the samples (if available) to get a rough idea of how much moisture they contain and then work backwards to determine an optimal sample size. Conversely, you can start with a very small sample size, knowing that the moisture content will be a percentage of the overall sample. Then, correlate the amount of moisture found with the measurement sensitivity of the moisture analyzer to make sure that you are within the effective measuring range of the instrument based on the sample size selected.
Explore Moisture Analyzers