Where can I buy all kinds of scales?

In the past, the stationery store had a scale with a triangular cross section, on which there were scales commonly expressed in proportion, but it was impossible to include them all; If necessary, you can go to a bigger stationery store. There are shops specializing in surveying and mapping instruments, and the other is to go online to have a look. Nowadays, computer drawing is used, and fewer people use this manual drawing tool.