10cm 4" Metric Pocket Size Aluminium Aluminum Triangular Scale Ruler 1:2.5 1:5 1:10 1:20 1:50 1:100

in my first year of architecture school i was introduced to the concept of working in scale as a refresher from the how to read and draw a scale floor plan video back in however months ago drawing to scale is drawing an accurate representation of something usually in a shrunken version of itself if you're studying architecture or engineering or a similar course you're going to have to know how to read and draw in scale in most cases this means using a scale ruler scale rollers come in different shapes and sizes but they all do the same thing they let you read off a scaled drawing and they let you draw your own scale drawings which is awesome they come with different scales because you often need to represent things at different scales for example a cabinet doesn't need to be shrunken as much as a whole floor plan design would need to be to fit onto a page the common scales you'll see on