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Canopy shake and catch mechanical harvesting systems are increasingly being used to harvest citrus fruits targeted for juice processing plants in Florida. Currently, there is no yield monitoring system commercially available for citrus mechanical harvesters and there is a need among the growers for a yield monitoring system for citrus mechanical harvesting machines. Evaluating different mass flow sensing systems requires a test bench that allows a series of repeatable tests under a control environment. Conducting such tests on a real mechanical harvester requires extensive machine downtime which would be very expensive. This paper discusses the development of the test rig, instrumentation, and data acquisition system used in the study as well as the results of the evaluation of a direct mass flow sensing technique and a computer vision based yield monitoring system.