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I need names (preferably with email addresses) of well established companies manufacturing and selling low diff pressure transmitters & gauges for HVAC applications in clean rooms. A reliable calibration kit is required as well. The pressures I am interested in are, Minimum 1Pa. normal 15Pa. Maximum 45Pa. Overpressure protection (100Pa) Materials SS316 Application: Differential pressure measurement across rooms. Hope someone can help me. Regards