Pt 28.835 Pd 29.999 Rh 130.21 Au 64.797 Ag 0.737
golden stones on scales on marble surface and blac 2021 08 31 03 39 06 utc@2x

Digital Caliper

As opposite to the ultrasonic thickness gauge that usually

Starts to measure  FROM 1MM THICK , AND NOT SUTABLE TO MESUARE COINS DIAMETER

The caliber do the job.

 https://amzn.to/4aQ1xkQ