We propose to build an inexpensive, open source, portable radio measurement system that can characterize high-value fruit and tree nut crops. While radiometry has been applied to questions of fruit and tree nut quality, to our knowledge, it has not been widely used to measure plant health in situ. Previous research suggests that radio imaging can be used to detect anomalies in plant tissue that are otherwise not visible, and can be used to nondestructively measure plant biomass.