The Faber Castell 153-D Triangular Scale Ruler is a precision tool used in technical drawing and architectural detailing. With a sleek design and a focus on accuracy, this ruler is perfect for engineers and surveyors. The triangular shape adds durability and stability, making it ideal for intricate designs. Perfect condition, barely used with protective case! Scales include; 1:20 / 1:33(1/3) / 1:25 / 1:50 / 1:75 / 1:100