You can buy these with a calibration certificate for like $70, but I skipped the cert. Should be the same quality, cost me $16. I chose the version with the superior units of measurement.
You can buy these with a calibration certificate for like $70, but I skipped the cert. Should be the same quality, cost me $16. I chose the version with the superior units of measurement.
Seriously, they are very useful if you are doing something relevant like drawing a scale plan for a house addition you want to build and have to submit a set of blueprints to the building inspector. Done that a few times. After the nerd cred, you pick up the framing hammer and start the real work.
In metric it’s easy to divide by 20 or 50. Still, the drawing board my father used as a civil engineer only had double-sided ones (1:1 and 1:50).