I was starting to doubt that my Discwasher Zerostat was working properly, after all, it's 20 years old. So I tried Zavato's test and got a shock, but still, does that prove it will remove static from a record? The old tried and true test of using a Styrofoam peanut clinging to the record proved my Zerostat is still functioning once the Styrofoam separated from the vinyl.
Not very scientific, but now I know these Zerostats last a long time.
