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A custom meter capable of handling corrosive fluids was developed to control sequential injection as part of an experimental probe-type fertilizer injector. The meter transmitted pressurized fluid from a stationary housing to a rotor and crankshaft assembly that revolved within the housing. Size and location of a slot in the flat rotor face dictated duration and timing of the injection interval. To maintain sealing and to compensate for wear between component contact surfaces, a unique floating pressure plate assembly faced with ultra high molecular weight (UHMW) polymer was located between the housing and rotor. Triple o-ring rotary seals installed using modified manufacturer-recommended groove dimensions prevented leaking of fluid from the meter. The meter operated successfully in laboratory and field evaluations of the fertilizer injector.