Over the last several years research has shown that by improving on the flow conditioners used in natural gas metering applications, measurement is improved and installation cost can be reduced. The standards developed for orifice meters (AGA 3/API 14.3 and ISO 5167)addresses the question of flow conditioner design and testing to ensure the meter performance when subjected to various flow perturbations. This paper reviews testing carried out by Southwest Research Inc. and the NOVA Research and Technical Centre performed on the CPA 50E flow conditioner in accordance with AGA 3/API 14.3 and ISO 5167.