[Andrew Schuetze]

I had not compared the Tetrix and Matrix metal gauge until this morning when I had been asked to measure after casual observations and assumptions and posting in another thread here on CD.

I've got both in house and have used them both now for summer robotics camps with no real issues. Big difference is in the angle beam and not much difference IMHO for the flats and corner connectors (1/64 or 0.015625)

Angle
Tetrix 0.12500 (1/8)
Matrix 0.06250 (1/16)
Flat Plate
Tetrix 0.078125 (5/64)
Matrix 0.06250 (1/16)
Corner Connector
Tetrix 0.078125 (5/64)
Matrix 0.06250 (1/16)
U-Channel
Tetrix 0.078125 (5/64)

The beauty of the expanded FTC raw materials list is that one can purchase aluminum stock in a couple of sizes if you really need what one kit has verses the other.