Surface Verification
Specialized wand sensors measure resistivity just beneath the surface to help detect counterfeit materials or contaminants on the outside of your coin or bar.
Our Comprehensive 4-Step Verification Process
Multiple measurements. One clear picture.
Our process tests both resistivity and density through up to four distinct measurements, helping identify plated, filled, or compositionally incorrect items without damaging them.
Deep “Thru Mode” Penetration
Onboard sensors send a signal through the sample from top to bottom to help detect foreign metals, such as tungsten or lead, hidden inside.
Precision Thickness Measurement
We electronically measure average thickness across the face of your item while accounting for relief, lettering, and design features.
Advanced Density Testing
By combining exact sample weight with precise dimensions, we perform a specific-gravity style density check against the expected alloy.
Why Choose PM Proof?
Confidence without compromise.
Our verification process is designed to protect condition, preserve value, and give you clear data before you buy, sell, store, gift, or add precious metals to your portfolio.
100% Non-Destructive
We will never cut, scratch, acid-test, or damage your valuable items during verification.
Tests Through Protective Cases
Our sensors can read through many plastic holders, cardboard flips, capsules, and protective assays, helping preserve condition and value.
Wide Range of Metals
We calibrate testing to the expected alloy, including pure gold, 22K gold, 90% coin silver, sterling, and .999 fine silver.
Local Minnesota Service
Professional precious metal verification for collectors, stackers, investors, estates, private sellers, and dealers across Minnesota.