I don't recommend going the Meseran route.
I inherited one in a previous life.  I found that the gauge R&R for the
instrument
was unacceptable.

The instrument drips a solvent containing an isotope onto the mask
surface, vents
it for a while and then measures the trace radioactivity which should be
proportional to the
amount of solvent that absorbs into the mask.  An undercured mask should
absorb more than
a fully cured mask.

We were seeing more variation in readings than we expected since our
curing process was
calibrated by other instruments for both temperature and time.  To
determine the viability of the
Meseran, we tested a piece of plate glass repeatedly as a set-up tool,
thinking that no mask would
be as impervious to solvent absorption as glass.  We not only got
unexpectedly high readings
but we got unacceptable variation in the readings.

At that point we decided to concentrate on oven calibration and quit
sending money to Meseran.

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