Ratio work demands a ruler that actually holds the scale you're working to. The Staedtler AS1212-3 is a 300mm scale ruler made for technical drawings and proportional measurement. You set the ratio, you draw the line, it holds. Clean markings, solid build, no wobble on the desk. Grab one and stop fighting a generic ruler that doesn't do the job
| brand | STAEDTLER |
| model | AS1212-3 |
| length_mm | 300 |
| type | Scale Ruler |
| use_case | Technical drawings, ratio work |
| category | Education & Craft |
| subcategory | Classroom Supplies |
