Scale Ruler 12in/30cm Triangular Aluminium Technical Drawing

A 12in/30cm triangular aluminium scale ruler used for technical drawing, plan reading and scaled measuring work. The six-scale format gives engineers, architects and drawing users a clear way to read and transfer common ratios without switching between separate rulers.

Used for drawing office work, architectural plans, engineering sketches and general layout marking, this type of ruler is handy when working from scaled drawings or preparing accurate line work. It suits professionals, students and anyone handling technical plans, whether for design work, measured drawings, workshop layouts or site-related reference work. For marking out dimensions from printed plans or checking scaled measurements at the desk, it keeps the job straightforward and easy to follow.

The triangular body keeps six different scales on one ruler, making it easier to keep the most-used ratios close to hand. Made from aluminium, it is a practical choice for regular use where a light but rigid rule is needed for drawing boards, desks or document folders. The 12in/30cm length is a familiar size for day-to-day measuring and scaled reading, while the marked ratios cover a useful spread for technical and architectural work. Having multiple scales on one tool also helps keep drawing equipment organised and reduces the need to carry separate scale rules.

Scale ruler scales specifications

• Length: 12in / 30cm scale ruler for desk, drawing and plan work.
• Construction: Aluminium body for a light and rigid feel in use.
• Design: Triangular format with 6 scales on one ruler.
• Scales: 1:20, 1:25, 1:50, 1:75, 1:100 and 1:125.
• Application: Useful for engineers, architects and technical drawing tasks.

A practical architectural scale ruler for keeping common drawing scales ready when accurate work matters.