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.
You need a [60" Johnson ](http://www.johnson.com/ Level J60 60" Aluminum Straight Edge | Johnson Level & Tool Mfg Company https://share.google/HQbAKGtEWP4jL6tjz)