12" 261P Engineers Scale Ruler 10 30 40 50 PPI Double Numbered 4 Bevel Scale

4 Bevel Flat Engineering 12" 261P Model Plastic Scale graduated 10, 20, 30, 40, 50, parts per inch. Four Bevel Flat Scales - high quality architects scales and engineers scale by Alvin. Perfect for Architectural & Engineering design the 260 series Alvin four-bevel scales are made of high impact white plastic. These scales are available in 6 inch and 12 inch lengths with printed graduations. Supplied in vinyl sheath.