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Previous researchers demonstrated the ability to adapt an AgLeader cotton monitor to a peanut combine. It was shown that the field weight could be accurately predicted with errors less than 10%. This project focused on expanding the previous work by redesigning the protective deflector plate and developing operating guidelines. Twelve loads of peanuts were harvested, seven Spanish and five Runner. These were weighed in the fields and inspections sheets for each load were obtained from the selling point. The yield monitor was post-calibrated using the net weights for five loads. Results indicate that errors can be reduced below five percent when at least four calibration loads are used. Moisture content may affect accuracy, but this data appear to show that peanut type has more influence on the accuracy of calibration. At this stage we recommend separate calibration for each type of peanut and using at least four calibration loads. Future efforts should further explore the effect of moisture content and different harvesting conditions with varying levels soil moving through the conveying system.