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“What is tens CB8000 used for”? It’s a multi-purpose tens device—great for tens for back pain, nerve pain, and even post-workout soreness. The tens CB8000 digital tens unit has a memory function that saves your favorite settings. Buy replacement pads from tens CB8000 amazon; they’re affordable and compatible. It’s a must-have for anyone with chronic pain, as it’s drug-free and easy to use