Post deleted by Gayle
You should have put this in the DIY section.
I would suggest that you increase your budget and seek out nothing less than a blend unit. A blend machine can do galvanic, blend and diathermy.
Once a person gets used to the insertions, they are safer for trying diathermy/thermolysis, but one must learn how to make a proper setting, and if they achieve any speed, how to work with an automatic treatment delay sensor.
The better the machine you get, the more comfortable the treatments will be, as long as a reasonable understanding of the use of the machine and general electrology exists.