Rounded tips are spaced at standard testing intervals from 1 to 15 mm apart. A 20 and 25 mm spacing also are given. One disk setting tests from 1 to 8mm, and the other setting tests from 9 to 15 mm. To change settings, just rotate the top disk until it clicks in place. Easy to read and use. Ideal for the home care therapist and for patient home use and for testing following nerve repair, grafts, and innervated tissue transfer for desensitization, or to determine the level of impairment. Includes instructions and a protective carrying case.