How does this anti-static mat work?

By rodion15
Dec 10, 2015
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  1. [​IMG]
    We have these mats at our workshop and I’m a bit puzzled on how they work.

    These mats have two black studs on opposite corners and one silver mat on another corner.

    My doubt is about the black studs: I measured continuity on these black studs with a multimeter and found that them to be non-conductive (measuring between any to spots inside the stud itself). Yet, the silver stud is conductive.
    What are these black studs for then? If I connect a cord to them to an earth bonding point, then they won’t do anything!.

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