Note on apple size
Choose apples that are medium-sized, slightly larger than a tennis ball. Avoid selecting apples that are too small or too large. Apples that are too large may have been treated with growth-stimulating chemicals, and apples that are too small are usually sour or mealy.
Observe the apple stem
Freshly harvested apples will have a new, fresh stem attached tightly to the fruit. Do not choose apples that have a fallen stem or a dry stem.
Inspect the apple skin
Don’t just choose apples with smooth skin; instead, you should choose apples with rough skin. In general, sweet apples have rough skin, meaning that they have received enough sunlight. Smooth skin apples are mostly sour.
Use your hands to feel and squeeze the apple
A delicious and juicy apple will be round, firm, and feel heavy in your hand. When you press your hand against the apple, it should feel firm and juicy, indicating a good apple. Try tapping your finger on the apple; if it produces a loud and clear sound, then it is a crisp and tasty apple.
Smell the fragrance of the apple
Ripe and delicious apples typically have a very pleasant aroma. Apples that are not fully ripe will have a less noticeable scent and are usually slightly sour and slightly bitter.
Weigh the apples
According to Khoevadep
