My wife has a problem with small seeds in her diet. One of her favorite granola products is loaded with seeds and this is perfect for removing them. And the birds enjoy them.
They work great. I take them when I go back packing and a small pan in case i see an area that interests me. Only change i would make is how they stack. Make the stacking ring a little deeper in the classifier and you could stack more of them in the same length.
I really like these classifiers. I can honestly say the best I've purchased so far.
Perfect for my intended needs. Great customer service.