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The Bios Primary Gas Flow Calibration portfolio of products offers the best in flow calibration across a broad spectrum of applications, from the industrial workplace and field locations to the most sophisticated process control systems and analytical laboratories.

All Bios flow devices are based on their proprietary DryCal® technology. Their innovative dry piston technology eliminates the need for messy, cumbersome bubble provers – and offers the superior accuracy, reliability and ease of operation that has made Bios products the first choice of flow professionals worldwide.

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