Veritas Steel Straightedges

It is ground flat over the entire length on both edges to within 0.0010".

No, it is stress relieved to remain true under temperature variation.

The 12" straightedge is best suited for smaller, more delicate checks such as testing plane soles, water stones, or other compact surfaces where a larger tool would be difficult to handle. The 24" straightedge is ideal for general machine set-up, including stationary tools such as planers and jointers, offering enough length and weight to stay steady during adjustments. The 36" straightedge is designed for larger machinery and long-bed jointers, making it a strong choice as a master shop reference for checking longer surfaces with confidence.

Yes, at 1 1/2" high it is wide enough to stand on edge unsupported, leaving both of your hands free.