So you would have to go to some extent to count them?
Because 2 fails is based on 0.1% of 2000 particles you need to first ensure there are at least 2000 particle to screen.
But if it was calculated against weight you could have any number of particles you would only have to do some math to calculate a percentage of fails by weight a sample of 2000 particles of CWS62 has a mass of approximately 43.6g. It would be approximation of-course and not as accurate as counting but a lot easier and the results could be used a lot more effectively.
Percentage to weight is already used to calculate size failures.
