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Analytical Tolerances

Two classes of calibration standards are available.  PRIMARY and CERTIFIED STANDARDS.

The PRIMARY STANDARD is the most accurate and is made by weight. Unless stated otherwise, the mixture is certified +/- 1% analytical of the numbers reported.

The CERTIFIED STANDARD is made by a combination of pressure and/or weight.  Unless stated otherwise, the mixture is certified +/- 2% analytical accuracy of the numbers reported.