The specifics I am unsure about but I know they make small handheld devices with the desired degree of accuracy. You can wiki their electrical resistivity. Just make sure you put them on something that doesn't conduct at all.
You can wikipedia the actual values of electrical resistivity.
Update: The device is called an ohmeter, I couldn't remember it before.
I have a 1 oz gold bar that I recently purchased and want to make sure that it is not a counterfeit tungsten bar. It's one of those PAMP Suisse bars and apparently several counterfeit gold bars of this kind have been discovered. I do not want to drill into the bar unless I absolutely have to and the weight differences are so small between tungsten and gold that I'd never be able to tell the difference if I weighed it on a scale, especially with the small margin of error a scale can have. Is there any other way that I can verify that this is real gold? If I took it to a dealer would they be able to verify this for me without drilling into the bar?
