A hearing test takes place in a sound-proofed room or cubicle. You will take a seat, put on some headphones and listen. 

The hearing care professional will start playing sounds that start at a bass tone and work up to treble tone. They will ask you to push a button when you hear each sound. 

Each time you press the button, the hearing care professional will plot your results which will enable them ascertain your hearing range. 

Once your type and degree of hearing loss has been determined, your hearing care professional will be able to decide how much amplification you will need. They may then show you a range of instruments appropriate for your individual hearing loss and together you can decide what is right for you.