TOP1US Handheld Spinal Massager, Chiropractic Adjustment Instrument with 3 Level Strength Settings, Spine Activator of the Tender Areas of the BodyThis chiropractic adjustment tool is used for cervical spondylosis, low back pain and health care, et Physical impulse principle, imitation man hand massage, bone adjustment. This tool is a high speed, low speed spine adjustment tool, can adjust the spine and arms and legs for manual assistance Subluxation diagnosis is detecting people's spine and osteoarthritis and estimates whether you have spine problems or joint displacement from the leg reaction