Bill,
the comments about not being calibrated are from those that:
1) are mistaken to some degree, as the individual strain gages come with calibration correction.
2) don't understand the consistancy of Youngs modulus in steels
3) fail to recognize pressure limitations in our guns is simply a broad-brush and indirect approach to stress/strain limitations of a particular gun.
For those that don't know, the device Bill and I have measures strain (stretch) of the steel and the software computes the pressure based on the measurements barrel wallthickness and diameters you input. This would be the same as getting raw strain data (the most accepted way of determining stress)and longhand calculating it using your wallthickness and diameter measurements.
