can anyone with experience reading this comment on the sheets Jamie posted? it's been a long time since i checked a block so i can't even begin to remember the numbers but off the top of my head aren't those numbers on the high side? it's also worth noting that you can drag the transducer to continuously read the thickness.

i have a stresstel UT mic and don't claim to be an expert with it but as with most mics you can adjust the velocity for a specific material. i took an old ear off a block and machined it to a known thickness for calibrating the mic.

think i need to dig that mic out and become more familiar with it