I dry apples with it. I usually use Fuji apples.
Skin and core the apple, cut the apple in halves, and slice (not too thin, not too thick), about 1/4 inch (?).
Put the slices in a large enough bowl of cold water with lemon juice (I never measure, but maybe 1/4 cup per bowl (?). you don't want it to be too sour either, just enough to help the apples not turn brown. Even if it does turn brown before you dry it, it will be OK.
I have a jar with confectioner sugar pre-mixed with ground cinnamon. I don't measure either, I just look at the color, it looks like very very light color of hot chocolate mix. After you experiment, add more (or less) cinnamon to your liking.
After the apple slices sit in the water for a few minutes, drain well. Sprinkle a couple of teasspoon of the sugar mixture on to the apple slices. Toss to mix well.
Arrange on the trays, dry at 125 degrees for about 8 hours.
I have also dried persimmons (both the fuyu, before the squirrel discovered my tree, and the other kind). Do the same thing, minus the cinnamon sugar combination). They are both delicious!