Fellow Quality Professionals,

I am trying to compare two measuring equipment, and I would like to confirm that the method I am using is the most appropriate.

The Facts;
1- What is being measured is the width of a line
2- The line is a Au plated circuit printed on a clear material
3- The measuring equipment is an optical inspection system that scans the edge of each side of the line and provides the width
4- The measuring system acts with almost no human interaction.
5- Lights, magnification, and position of the parts in the equipment are the same as both systems work with the same software

The test method;
1- 20 pieces with the same feature were selected.
3- All pieces were fabricated at the same time & under similar conditions
4- One feature is measured within each piece once.
5- All 20 pieces are measured in each equipment for a total of N=20
6- A pared t test is used to verify whether u1 = m2
7- The variance will be tested also to be the same between both pieces of equipment

Please let me know whether you would consider a different method should be applied.

Thank you,
Fernando