A Tens unit does not "detect" pain. It is used as "thearapy" for the pain. The problem is, you have to know where to place the tens unit pads or else it's useless which is typically the case. The MPDD directly identifies the ACTUAL SOURCE of the pain and not the ASSUMED SOURCE of the pain. A tens unit consists of two rubbery like pads whereas the MPDD is a handheld unit with a metalic like surface that glides slowly across the skin to identify the source of the pain. Having had nerve pain for years, I can tell you that you feel the pain coming from a specific spot in your back, but that actually isn't the cause of your pain. That's what makes this device so unique. It's unbelievable how it "grabs" the trigger point and basically says to the doctor, "Hey, here's what's causing the pain, fix it". The treatment is very quick and practically painless.
