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For Tom Reynolds and all: I believe that Robert Lascano has done some work on comparison of the theta probe to gravimetric water contents (r-lascano@tamu.edu). Contact him to see if he has published. I doubt if anyone has compared the theta probe to neutron scattering. The measurement volumes and depths of application are so different it wouldn't make a lot of sense to directly compare these two (or am I missing something). I'm thinking of the "theta probe" with pointed rods that one presses into the soil. About the AquaFlex sensor, I've been following the discussion with interest. But in all of it I've not yet found a good technical description of how it works. That is much needed in this discussion. References to technical papers evaluating this probe are also needed. Best wishes -------- Steve Evett srevett@ag.gov http://www.cprl.ars.usda.gov/ USDA-ARS, P.O. Drawer 10, 2300 Experiment Station Road Bushland, Texas 79012. Tel:806.356.5775 FAX:806.356.5750 ---------------------------------------------------