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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[–] 12 points 1 year ago (1 child)

They could measure themselves and just send the ones that meet the criteria for certification by someone else. Anyway it's a funny tinfoil theory and they are probably all good quality.

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