2. Examine the keywork. The keywork on a good saxophone should be smooth and responsive, with no sticking or binding. The keys should also be well-aligned and properly spaced.
3. Look at the mouthpiece. The mouthpiece is an important part of the saxophone, and a good mouthpiece can make a big difference in the sound and playability of the instrument. Look for a mouthpiece that is made of high-quality material, such as hard rubber or metal, and that is the correct size and shape for your saxophone.
4. Listen to the sound. If possible, try to play the saxophone before you buy it. This will give you a chance to hear the sound of the instrument and to see how it feels to play. A good saxophone will have a rich, full sound and will be easy to play.
5. Consider the price. A good saxophone can be a significant investment, but it is important to remember that you are buying an instrument that will last a lifetime. A cheap saxophone may be tempting, but it is likely to be made of poor-quality materials and will not sound or play as well as a good saxophone.