Pt 31.857 Pd 29.967 Rh 144.678 Au 74.586 Ag 0.947
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