Mesko’s “Work Hardening” method is the old “Copper-Crusher” system, which Measures CUP, and NOT atmospheres or PSI etc. The CUP figures have then to be converted to “normal” Pressure Units…That is why everybody uses Piezo-electric Methods Now, even though there is still the difference of Sensor Positioning ( Drilled case or Case Mouth) This difference catches the pressure change at different Points in the Powder Combustion Cycle…the Drilled Shell from Ignition through to Bullet exit,. but the Case Mouth system only records from the moment the Bullet clears the Bleed Hole at the case Mouth, so the initial Primer ignition pressure, Initial flame up of Powder, and then the rapid rise in In-Case pressure is not recorded…only the High Pressure ( and subsequent drop) as the Bullet is released from the Neck seal and enters the Leed of the rifling.( another spike here as well).
Kistler is a general maker of Piezo-electric transducers for all sorts of industrial applications, from Internal combustion engines to Jet and rocket engines to Ordnance ( both SA and Artillery).
The Former company of AV-Link, of Graz, Austria, made a range of Chronograph/Pressure Measuring devices for the Various Ammo Factories and Laboratories world wide…they also did Prototype MB Engine testing at their Graz Facility ( Saw it in 1996, during a Visit). Their Small arms Pressure system was really stand alone and Portable. ( I saw them in operation at Sellier & Bellot, Vlasim, during the same trip)
and the Best “Value for Money” if one knew what to get. Sadly, this company no longer exists ( Financial problems).