Using ultrasonic tester agaings fake coins

[thebeginner]

Hi.

Im pretty sure that we all are scared of these quality fake coins that are out there on the marked.

I always test my gold Maples with a electronic jewlers weight, electronic caliper and neodym magnet. And last an not least with a handheld XRF Analyzer. For those who are interested: look at one of the xrf reports/results in the photo below. Then one day i saw this: Youtube link, a guy talking about that the XRF might fail, because of the thick plating on the silver bar?!?

This made look into alternative, non-destructive testers:

• The Precious Metal Verifieris ($650), meassures the electrical characteristics of the object.
• TM-8812 Ultrasonic tester ($180), meassures thickness of the the object. 
• Gemoro AGT1 ($350), meassures conductivity of the the object. 

Correct me if Im wrong, but Im pretty sure that a ultrasonic sound can not be "cheated" with small objects like a coin or a bar. And with a resolution on 0.01mm and  accuracy ±(0.5%n+0.1) I thought Ide give the TM-8812 a go, and I orded one of ebay. I will post testing results in this thread. The ultrasonic tester is also handheld, wich makes it easy to carry around on coin shows.

Quick questions to the Silver Forum Comunity:

1. Anyone know where I can get a quality fake tungsten Maple Leaf?
2. Does the gel (Nitroglycerin) damage/react with Au (gold)?
3. Anyone have some experience with ultrasonic testers?

 

[Paul]

• The Precious Metal Verifieris ($650), meassures the electrical characteristics of the object.
• TM-8812 Ultrasonic tester ($180), meassures thickness of the the object. 
• Gemoro AGT1 ($350), meassures conductivity of the the object. 

$1,180 total

If genuine & authenticity is your main concern.  Just buy new product direct from your own countries official mint. 

You could have had nearly an extra 1oz of gold of your stack without purchasing these 

[thebeginner]

8 minutes ago, Paul said:

$1,180 total

• If genuine & authenticity is your main concern.  Just buy new product direct from your own countries official mint. 

You could have had nearly an extra 1oz of gold of your stack without purchasing these 

Hi Paul. 

Thanks for your advice. I know my english sucks, but I dont think you read my whole thread? "I thought Ide give the TM-8812 a go, and I orded one of ebay." Thats $180 bucks, never mentioned that im gonna buy the other testers.

Cheers

 

 

[mr-dead]

For what a decent tester costs it would probably work out cheaper just to pay a little extra per coin and buy direct from the mints or large and trusted dealers. 

[sovereignsteve]

7 hours ago, thebeginner said:

Does the gel (Nitroglycerin) damage/react with Au (gold)?

Isn't nitroglycerin  an explosive? so yes, I think it would interact with gold!

 

[tbone]

I have a Precious Metal Verifier Original (See:  http://sigmametalytics.com/  ,   http://sigmametalytics.com/purchase/pmv-original-description.html ) and from my experience it works well.  I've used it on as small as 1/10 oz gold to a 10oz silver bar.  It also has settings for common alloys like 22k or 90% etc.  I'm not a dealer so I don't encounter a lot of fakes, but I've tested on a few plated coins and coins of lesser purity (40% etc). 

That said, I don't use it as much as I originally thought, mostly because I tend to buy more from trusted dealers than from ebay (although I should probably use it more anyway)

[ilovesilverireallydo]

On 11/03/2018 at 16:16, thebeginner said:

XRF might fail, because of the thick plating

XRF fails on many fronts. For example 40% Kennedy halves scan as 80% Silver, because it has a higher content on its top later finish. 

Some XRF can’t tell the difference between rolled Gold and full Gold either.