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<p>[QUOTE=&quot;LakeEffect, post: 12263703, member: 43201&quot;]I assume they use something akin to <a href="https://en.wikipedia.org/wiki/Radio-frequency_identification" target="_blank" class="externalLink ProxyLink" data-proxy-href="https://en.wikipedia.org/wiki/Radio-frequency_identification" rel="nofollow">RFID</a>, which in its simplest form requires no battery and should last indefinitely. They cost less than a dollar, sometimes much less.</p><p><br /></p><p>The passive RFID is installed in the slab. When in close proximity to a reader, the reader provides the power to the RFID, allowing the RFID to respond with it&#039;s coded ID.</p><p><br /></p><p>[disclaimer]: I have no idea how PCGS really does it, I&#039;m making assumptions as an engineer.[/QUOTE]</p><p><br /></p>

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