# I tried using KOKUYO's 'real ruler' that can measure the length accurately with 'scale line without width'

Since the scale line of a general ruler has a width, many people have had the experience of trying to draw a line of the correct length with a ruler and wondering 'how far should I draw this scale line?' .. The 'real ruler ' born from the

Kokuyo Design Award , an international product design competition, has a line width that measures the length not by 'lines at 1 mm intervals' but by 'borders of surfaces painted every 1 mm'. It does not exist and it is possible to measure the length more accurately, so I actually checked the usability.

Real Ruler ｜ KOKUYO Stationery
https://www.kokuyo-st.co.jp/stationery/true_measure/

A 'real ruler' is a stainless steel straightedge with a scale of up to 15 cm.

The ruler is in a protective cover ...

It looks like this when you take it out of the cover.

The top is painted in 1 mm increments and the bottom is painted in 0.5 mm increments.

If you look at the 0.5 mm wide scale of the 'real ruler' (top) and the ordinary ruler (bottom) side by side, the scale of the ordinary ruler is a black line with a width of about 0.3 mm, whereas the 'real ruler' has a black line. You can see that the boundary between the black-painted surface and the unpainted surface is a scale, and there is no 'scale width'.

To see the difference in usability, first draw a line up to the 2 cm scale with an ordinary ruler ...

Similarly, try drawing a 2 cm line with a 'real ruler'.

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 if you want to draw an accurate line.

However, the 'real ruler' is not the type that has a margin in front of the zero scale ...

If you want to draw a 15 cm line, you have to align the pen tip with the corner of the ruler, which is a little difficult.

Instead, the tip of the ruler can be attached to the wall surface, etc., so if you want to use the ruler to 'measure the length and height of an object', the 'real ruler' is more suitable.

KOKUYO's 'real ruler' is handled by Amazon.co.jp, and the price at the time of article creation is 1125 yen including tax.

Amazon | KOKUYO Real Ruler 15cm | Ruler | Stationery / Office Supplies

in Review, Posted by log1l_ks