Secrets to ease of use are in a row
The most common 6 different gradations on the 3 sides of the 6 sides, 1/100, 1/200, 1/300, 1/400, 1/500, and 1/600.Because these scales are different in order by manufacturer, you may find the scale you need to work around and turn it around when you turn it, but this triangular scale is arranged in order of numbers, so it is easy to find and work efficiently.