Triangular scale (sansuke) used in architecture and drafting, and a straight ruler

I used these previously for architectural drawings.
They have some signs of use, but I appreciate your consideration.
I believe the triangular scale, in particular, is a rare item.

1. Triangular Scale (Center of Image)
The item in the center of the image, with a triangular cross-section and red, black, and green lines, is a triangular scale. This ruler has multiple scales (e.g., 1/100, 1/200) engraved on it and is used to measure actual lengths from drawings.
Brand: This product is made by PLUS, and the model number is presumed to be B7543.
Main Scales: It typically features six scales: 1/100, 1/200, 1/300, 1/400, 1/500, and 1/600.

2. Storage Case (Top of Image)
The transparent plastic case above the triangular scale has a blue PLUS logo and a wave-like mark. This is a dedicated case to protect the triangular scale from scratches and for carrying it.

3. This is a plastic ruler from the ITO (Ito Seichu) brand.
It features a transparent brown coloring.
The scale runs from 0 to 40, allowing measurements up to 40cm.
It has the ITO logo.
It has a metal edge, making it suitable for use with a cutter.