Based on this product's specifications, here are some alternatives and similar models
Measuring ruler Gimex rigid gauge 300 x 40 x 5 mm 214.711
Summary description:
Rigid measuring gauge from Gimex, model 214.711, with external dimensions 300 x 40 x 5 mm. Designed for precise length and alignment checks where a stiff, non-flexing straightedge is required. Suitable for workshop, carpentry, metalworking and inspection tasks to measure, mark and verify straightness and distances.