A fluid conditioner for a fluid traveling through a conduit, the conduit having a longitudinal axis and substantially circular cross-section. The fluid conditioner includes a static mixing element and a straightener plate. The plate is affixed to a substantially rectangular member located downstream of the static mixing element and oriented substantially perpendicularly to the longitudinal axis of the conduit, the plate substantially covering the cross-section of the conduit having a plurality of openings to facilitate the passage of the fluid within the conduit.