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>> No.57276633 [DELETED]  [View]
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57276633

>>57276566
Craigslist is good too. If you have calipers, a scale, and an ultrasonic thickss gage, you're as powerful as a sigma tester device.

>> No.57273843 [DELETED]  [View]
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57273843

Also an ultrasonic thickness gauge is a lot cheaper than a sigma or xrf and it can be just as effective. Speed of sound of silver is like 3600 m/s. Anything not silver will give you a large error in the thickness reading. I have a pair ofnice ones in my inspections office.

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