I also have a Tens unit. I received mine at the PT office. There was no fitting or eval. Once my Insurance oked it, the PT handed the unit to me explained in less than 2 minutes how it worked and told me to give it a try. A month later, I received a letter from the company that issued the Tens unit and they stated that the Insurance was refusing to pay for it. So they sent a prepaid box to ship it back. Then my Insurance comp. had another unit shipped to me and all I do is contact the company and they send me supplies
I need. Once, one of my electrical leads broke and the comapany just sent me another set through the mail. I don't know if I get much relief from it. I try it for awhile and then quit. Then try it again for a week or so. I am hoping to get into a PMS within several weeks and they wanted to know if I had used a Tens unit as that would be one avenue they wanted to look into. Good luck with yours, I hope it relieves some of the pain.