Look for peppers that are the right size. Italian peppers can range from about 2 to 7 inches in length, but any smaller means the pepper is probably not developed.
Test the diameter of the pepper. Unlike other types of peppers, Italian peppers tend to be thin. A diameter of about 3/4 inch is ideal.
Check out the color of the pepper. Depending on the variety you're picking, the Italian pepper should be a bright vibrant red, green or yellow color. Peppers with black or brown spots or uneven color should be avoided.
Touch the pepper. Italian peppers are crisp and crunchy when raw. The pepper you pick should be firm, with no soft or mushy areas.