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.

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[–] [S] 1 point 11 months ago

Yeah... I use 0.9mm lead in my drafting pencil. I tried 0.3mm once but it breaks if you breathe on it too hard.

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