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With a tensiometer, can we measure the potential difference between two points in millimeter precision?

Millimeter scale is tough. Centimeter scale, I would say yes. Check out the TEROS 31 Tensiometer. The diameter of the shaft is 5 mm, and the water potential measurement with the TEROS 31 is extremely precise. You should be able to quantify a water potential gradient across about 1-2 cm with a pair of these. But to answer your question, I don’t know of any instrument small enough for mm scale measurement. There was a group working on a MEMs tensiometer that could maybe do that, but I don’t think it is on the market presently.

 

Related software downloads

TEROS 31 Tensiometer manual Manual PDF, 1.8MB
TEROS 31 Quick Start Quickstart Guide PDF, 1.4MB
TEROS 31 Integrator Guide Integrator Guide PDF, 0.6MB