Los Angeles-based studio Ensso has designed an all-in-one fountain pen with scale ruler for ... 1:200, 1:400, and 1:500) and six following the imperial system (1/32, 1/16, 1/8, 1/4, 1/ ...

The Smart Scale ruler is currently working with Kickstarter and accepting pre-orders at the beginning of April 2018. [Update: The Smart Scale Kickstarter has now launched! You can order yours here .] ...

Then, the line drawn with an ordinary ruler (top) was longer than the line drawn with a 'real ruler' (bottom) by about 0.3 mm in width of the scale line. It's a small difference, but it's annoying ...