A ceramic ruler has the advantages that it is stiffer and more stable, won't nick or dent and is all but immune to corrosion. Even welding spatter can usually be scratched off with your finger nail!
The edge of this ruler is lapped straight to within a few microns and the graduations are accurate to within 0.1 mm.
Ceramic Oxide Fabricators (Australia) | Industrial and Scientific Ceramics
Since 1971 we have been manufacturing and distributing high-tech ceramics for science and industry. Our products are used for abrasion, corrosion, and electrical resistance, laboratory ware, and ...