How do I "read" a spark plug?

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<blockquote class="wp-embedded-content" data-secret="Xw1jBcj1sO"><a href="https://ngksparkplugs.com/en/resources/read-spark-plug">How do I &#8220;read&#8221; a spark plug?</a></blockquote><iframe sandbox="allow-scripts" security="restricted" src="https://ngksparkplugs.com/en/resources/read-spark-plug/embed#?secret=Xw1jBcj1sO" width="600" height="400" title="&#8220;How do I &#8220;read&#8221; a spark plug?&#8221; &#8212; NGK Spark Plugs" data-secret="Xw1jBcj1sO" frameborder="0" marginwidth="0" marginheight="0" scrolling="no" class="wp-embedded-content"></iframe><script type="text/javascript">
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