Message:

<p>[QUOTE=&quot;-jeffB, post: 2785547, member: 27832&quot;]I just meant that poking the coin with metal probes is likely to scratch it. You generally must push quite hard to get good electrical contact for measuring resistance. I&#039;m not sure how to do that without leaving a mark on the coin&#039;s surface.</p><p><br /></p><p>The basic problem is that the resistance of the connection between each probe and the coin will usually be much, much larger than the resistance of the coin itself. And the connection resistance is highly variable based on how hard you&#039;re pressing on the probes.[/QUOTE]</p><p><br /></p>

Your name or email address:

Do you already have an account?

• No, create an account now.
• Yes, my password is:
• Forgot your password?

Stay logged in