I tested 10 grounding mattress covers and 10 grounding sheets so you don't have to. After spending thousands of dollars and months of testing with a multimeter, I found most grounding mattress covers have a major problem nobody talks about. Some grounding sheets weren't much better โ losing conductivity after just a few washes. But ONE setup actually worked. Consistent readings month after month. Here's what I learned (and what to avoid) ๐