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.
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).