How to choose not only juicy lemons but lemons with less acrid flavor
For thin-skinned, you can try pressing the lemon, they are thin-skinned if you can kinda feel the lemon flesh. While if it is thick-skinned it will be very hard to press. (i mean press in a way not to destroy the lemon).
Generally, the deeper the yellow color, the less sour the lemon is, as it is riper. So if there is any pale yellow or green, then it is not ripe enough. All citrus fruits are green while they are still growing on the tree. As lemons ripe, they lose their green color because the chlorophyll pigment is replaced with a chemical called anthocyanin.