We are working with a good source and will have probes and tuning forks for sale soon. In the mean time, if you have a belt sander, you can just refine the tip until it’s like a very, very dull pencil. The end surface being about 2mm.
For anyone wondering why we’re talking about this, see here:
Practical Auricular Therapy (Early Access)
Don't use herbs or combine herbs with medications or use them during lactation or pregnancy without talking with your healthcare provider.