Tibetan singing bowls are a fantastic aid for meditation! I bought mine last year and it has been such a help to my meditation practice. I ring the bell at the start and end of practice, with the starting sound very helpful in my entering a meditative state. I focus on the ringing as long as possible, until it cannot be heard any longer and then I shift focus to my breath.
There are many examples online. This one might be of assistance, if you want to experience the effect before getting your own bowl: