"Jim Wilkins" wrote in message
news
"rangerssuck" wrote in message
..................
You can look up the cylinder volume and measure the pressure.

I don't have anything to measure that kind of pressure with any
significant accuracy or precision. My highest range transducer tops
out at 500psi.

http://www.dfs-gauges.com/images/sup...s_accu_def.pdf

You may need this too:
https://www.concoa.com/cgachart.html
-jsw